174-630: Downtown is a term primarily used in North America to refer to a city's sometimes commercial , cultural and often the historical, political , and geographic heart. It is often synonymous with its central business district (CBD). It may also be a center for shopping and entertainment. Downtowns typically contain a small percentage of a city's employment but are concentrated in services, including high-end services (office or white-collar jobs). Sometimes, smaller downtowns include lower population densities and nearby lower incomes than suburbs . It
348-561: A writing system , built huge pyramids and temples , had a complex calendar , and developed the concept of zero around 400 CE. The first recorded European references to North America are in Norse sagas where it is referred to as Vinland . The earliest verifiable instance of pre-Columbian trans-oceanic contact by any European culture with the North America mainland has been dated to around 1000 CE. The site , situated at
522-541: A city consisting entirely of high-rise housing is the 16th-century city of Shibam in Yemen . Shibam was made up of over 500 tower houses, each one rising 5 to 11 stories high, with each floor being an apartment occupied by a single family. The city was built in this way in order to protect it from Bedouin attacks. Shibam still has the tallest mudbrick buildings in the world, with many of them over 30 m (98 ft) high. An early modern example of high-rise housing
696-412: A city. Zoning rules would regulate not only height, but also a building's volume, the percentage of the lot used, and the amount of light the building blocked. Zoning regulations sometimes encouraged setbacks (step-like recessions in the outer wall, making higher-up segments of the building progressively narrower than the base) to reduce a building's bulk by allowing additional height per foot of setback –
870-465: A larger area. In the short run, the proponents of height limits were successful in their efforts. By the 1910s, most of the large and medium-sized cities had height limits in effect, although New York, Philadelphia, Detroit, Pittsburgh, and Minneapolis were notable exceptions. Ultimately, it was not simple height limits that restricted skyscrapers, but they were limited by comprehensive zoning laws which set up separate requirements for different parts of
1044-751: A more classical approach came back to global skyscraper design, that remains popular today. Examples are the Wells Fargo Center , NBC Tower , Parkview Square , 30 Park Place , the Messeturm , the iconic Petronas Towers and Jin Mao Tower . Other contemporary styles and movements in skyscraper design include organic , sustainable , neo-futurist , structuralist , high-tech , deconstructivist , blob , digital , streamline , novelty , critical regionalist , vernacular , Neo Art Deco and neohistorist , also known as revivalist . 3 September
1218-597: A part of Denmark) and Mexico classified as Latin American). It is unknown with certainty how and when first human populations first reached North America. People were known to live in the Americas at least 20,000 years ago, but various evidence points to possibly earlier dates. The Paleo-Indian period in North America followed the Last Glacial Period, and lasted until about 10,000 years ago when
1392-399: A particularly small surface area of what are conventionally thought of as walls. Because the walls are not load-bearing most skyscrapers are characterized by surface areas of windows made possible by the concept of steel frame and curtain wall. However, skyscrapers can also have curtain walls that mimic conventional walls and have a small surface area of windows. The concept of a skyscraper is
1566-664: A period of mountain building called the Laramide orogeny , between 80 and 55 mya. The formation of the Isthmus of Panama that connected the continent to South America arguably occurred approximately 12 to 15 mya, and the Great Lakes (as well as many other northern freshwater lakes and rivers) were carved by receding glaciers about 10,000 years ago. North America is the source of much of what humanity knows about geologic time periods. The geographic area that would later become
1740-590: A powerful earthquake killed seven people in 2009. Volcanic eruptions are common in the region. In 1968, the Arenal Volcano , in Costa Rica, erupted and killed 87 people. Fertile soils from weathered volcanic lavas have made it possible to sustain dense populations in agriculturally productive highland areas. Central America has many mountain ranges ; the longest are the Sierra Madre de Chiapas ,
1914-420: A product of the industrialized age , made possible by cheap fossil fuel derived energy and industrially refined raw materials such as steel and concrete . The construction of skyscrapers was enabled by steel frame construction that surpassed brick and mortar construction starting at the end of the 19th century and finally surpassing it in the 20th century together with reinforced concrete construction as
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#17327655247252088-454: A proto-skyscraper, or to New York's seven-floor Equitable Life Building , built in 1870. Steel skeleton construction has allowed for today's supertall skyscrapers now being built worldwide. The nomination of one structure versus another being the first skyscraper, and why, depends on what factors are stressed. The structural definition of the word skyscraper was refined later by architectural historians, based on engineering developments of
2262-412: A proud and soaring thing, rising in sheer exaltation that from bottom to top it is a unit without a single dissenting line. Some structural engineers define a high-rise as any vertical construction for which wind is a more significant load factor than earthquake or weight. Note that this criterion fits not only high-rises but some other tall structures, such as towers . Different organizations from
2436-571: A skyscraper today, it was record setting. The building of tall buildings in the 1880s gave the skyscraper its first architectural movement, broadly termed the Chicago School , which developed what has been called the Commercial Style. The architect, Major William Le Baron Jenney , created a load-bearing structural frame. In this building, a steel frame supported the entire weight of the walls, instead of load-bearing walls carrying
2610-417: A small surface area of windows. Modern skyscrapers often have a tubular structure , and are designed to act like a hollow cylinder to resist wind, seismic, and other lateral loads. To appear more slender, allow less wind exposure and transmit more daylight to the ground, many skyscrapers have a design with setbacks , which in some cases is also structurally required. As of September 2023 , fifteen cities in
2784-521: A time, the tallest of which is the 97.2 m (319 ft) high Asinelli Tower. A Florentine law of 1251 decreed that all urban buildings be immediately reduced to less than 26 m. Even medium-sized towns of the era are known to have proliferations of towers, such as the 72 towers that ranged up to 51 m height in San Gimignano . The medieval Egyptian city of Fustat housed many high-rise residential buildings, which Al-Muqaddasi in
2958-619: A unique name, unlike the former boroughs surrounding it; the center of the city is also where Philadelphia City Hall is located within the city's original plat . New Orleans uses the term Central Business District (or CBD) for its downtown due to the French Quarter and other historic neighborhoods downriver from the CBD being referred to as "downtown" . United States (50 most populous American cities) Canada North America North America
3132-540: A variety of reactions, including curiosity, trading, cooperation, resignation, and resistance. The indigenous population declined substantially following European arrival, primarily due to the introduction of Eurasian diseases, such as smallpox , to which the indigenous peoples lacked immunity, and because of violent conflicts with Europeans. Indigenous culture changed significantly and their affiliation with political and cultural groups also changed. Several linguistic groups died out , and others changed quite quickly. On
3306-466: A variety of shapes, and it could be riveted, ensuring strong connections. The simplicity of a steel frame eliminated the inefficient part of a shear wall, the central portion, and consolidated support members in a much stronger fashion by allowing both horizontal and vertical supports throughout. Among steel's drawbacks is that as more material must be supported as height increases, the distance between supporting members must decrease, which in turn increases
3480-469: A vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation". Closely spaced interconnected exterior columns form the tube. Horizontal loads (primarily wind) are supported by the structure as a whole. Framed tubes allow fewer interior columns, and so create more usable floor space, and about half the exterior surface is available for windows. Where larger openings like garage doors are required,
3654-883: Is a continent in the Northern and Western Hemispheres . North America is bordered to the north by the Arctic Ocean , to the east by the Atlantic Ocean , to the southeast by South America and the Caribbean Sea , and to the west and south by the Pacific Ocean . The region includes the Bahamas , Bermuda , Canada , the Caribbean , Central America , Clipperton Island , Greenland , Mexico , Saint Pierre and Miquelon , Turks and Caicos Islands , and
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#17327655247253828-665: Is a very large continent that extends from north of the Arctic Circle to south of the Tropic of Cancer . Greenland, along with the Canadian Shield , is tundra with average temperatures ranging from 10 to 20 °C (50 to 68 °F), but central Greenland is composed of a very large ice sheet. This tundra radiates throughout Canada, but its border ends near the Rocky Mountains (but still contains Alaska) and at
4002-524: Is an ancient craton which forms the geologic core of North America; it formed between 1.5 and 1.0 billion years ago during the Proterozoic eon. The Canadian Shield is the largest exposure of this craton. From the Late Paleozoic to Early Mesozoic eras, North America was joined with the other modern-day continents as part of the supercontinent Pangaea , with Eurasia to its east. One of
4176-704: Is having a steel frame that supports curtain walls . This idea was invented by Viollet le Duc in his discourses on architecture. These curtain walls either bear on the framework below or are suspended from the framework above, rather than resting on load-bearing walls of conventional construction. Some early skyscrapers have a steel frame that enables the construction of load-bearing walls taller than of those made of reinforced concrete . Modern skyscraper walls are not load-bearing , and most skyscrapers are characterized by large surface areas of windows made possible by steel frames and curtain walls. However, skyscrapers can have curtain walls that mimic conventional walls with
4350-406: Is important in most building design, but particularly for skyscrapers since even a small chance of catastrophic failure is unacceptable given the tremendous damage such failure would cause. This presents a paradox to civil engineers : the only way to assure a lack of failure is to test for all modes of failure, in both the laboratory and the real world. But the only way to know of all modes of failure
4524-546: Is in present-day Panama at the Darien Gap on the Colombia -Panama border, placing almost all of Panama within North America. Alternatively, some geologists physiographically locate its southern limit at the Isthmus of Tehuantepec , Mexico, with Central America extending southeastward to South America from this point. The Caribbean islands, or West Indies, are considered part of North America. The continental coastline
4698-433: Is largely from the force of the building material itself. In most building designs, the weight of the structure is much larger than the weight of the material that it will support beyond its own weight. In technical terms, the dead load , the load of the structure, is larger than the live load , the weight of things in the structure (people, furniture, vehicles, etc.). As such, the amount of structural material required within
4872-407: Is located. Most major North American cities are located on major bodies of water, like oceans, lakes, and rivers. As cities expanded, people built further away from the water and their historical cores, often uphill. Thus the central business district of a North American city, or the historical core of the city, is often located "down", in altitude, relative to the remainder of the city. Many cities use
5046-648: Is long and irregular. The Gulf of Mexico is the largest body of water indenting the continent, followed by Hudson Bay . Others include the Gulf of Saint Lawrence and the Gulf of California . Before the Central American isthmus formed, the region had been underwater. The islands of the West Indies delineate a submerged former land bridge , which had connected North and South America via what are now Florida and Venezuela . There are several islands off
5220-472: Is often distinguished as a hub of public transit and culture. The Oxford English Dictionary ' s first citation for "down town" or "downtown" dates to 1770, in reference to the center of Boston . Some have posited that the term "downtown" was coined in New York City , where it was in use by the 1830s to refer to the original settlement, or town , at the southern tip of the island of Manhattan . As
5394-561: Is part of North America geographically. In a geologic sense, Bermuda is not part of the Americas, but an oceanic island that was formed on the fissure of the Mid-Atlantic Ridge over 100 million years ago (mya). The nearest landmass to it is Cape Hatteras , North Carolina . However, Bermuda is often thought of as part of North America, especially given its historical, political and cultural ties to Virginia and other parts of
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5568-707: Is the Morrison Formation of the western U.S. Canada is geologically one of the oldest regions in the world, with more than half of the region consisting of Precambrian rocks that have been above sea level since the beginning of the Palaeozoic era. Canada's mineral resources are diverse and extensive. Across the Canadian Shield and in the north there are large iron, nickel, zinc , copper, gold, lead, molybdenum , and uranium reserves. Large diamond concentrations have been recently developed in
5742-527: Is the humid subtropical climate . This area has the wettest cities in the contiguous U.S. , with annual precipitation reaching 67 in (1,700 mm) in Mobile, Alabama . Stretching from the borders of the humid continental and subtropical climates, and going west to the Sierra Nevada , south to the southern tip of Durango , north to the border with tundra climate, the steppe / desert climates are
5916-399: Is the global commemorative day for skyscrapers, called "Skyscraper Day". New York City developers competed among themselves, with successively taller buildings claiming the title of "world's tallest" in the 1920s and early 1930s, culminating with the completion of the 318.9 m (1,046 ft) Chrysler Building in 1930 and the 443.2 m (1,454 ft) Empire State Building in 1931,
6090-419: Is to learn from previous failures. Thus, no engineer can be absolutely sure that a given structure will resist all loadings that could cause failure; instead, one can only have large enough margins of safety such that a failure is acceptably unlikely. When buildings do fail, engineers question whether the failure was due to some lack of foresight or due to some unknowable factor. The load a skyscraper experiences
6264-454: The Age of Discovery and the early modern period . Present-day cultural and ethnic patterns reflect interactions between European colonists, indigenous peoples , enslaved Africans , immigrants from Europe, Asia, and descendants of these respective groups. Europe's colonization in North America led to most North Americans speaking European languages, such as English , Spanish , and French , and
6438-519: The Archaic period began. The classic stage followed the Archaic period, and lasted from approximately the 6th to 13th centuries. Beginning in 1000 AD, the Norse were the first Europeans to begin exploring and ultimately colonizing areas of North America. In 1492, the exploratory voyages of Christopher Columbus led to a transatlantic exchange , including migrations of European settlers during
6612-567: The Bering Strait during the Early-Middle Holocene . Prior to the arrival of European explorers and colonists in North America, the natives of North America were divided into many different polities, ranging from small bands of a few families to large empires. They lived in several culture areas , which roughly correspond to geographic and biological zones that defined the representative cultures and lifestyles of
6786-600: The British Columbia Coast , Western Canada , and Northern Canada . In the U.S., they include New England , the Mid-Atlantic , South Atlantic states , East North Central states , West North Central states , East South Central states , West South Central states , Mountain states , and Pacific states . The Great Lakes region and the Pacific Northwest include areas in both Canada and
6960-913: The Caribbean Plate , whereas the Juan de Fuca Plate and Cocos Plate border the North American Plate on its western frontier. The continent can be divided into four great regions (each of which contains many subregions): the Great Plains stretching from the Gulf of Mexico to the Canadian Arctic ; the geologically young, mountainous west, including the Rocky Mountains , the Great Basin , California , and Alaska ;
7134-497: The Chicago River to Michigan Avenue . In fact, the instability of downtown was a cause for concern for business and real estate interests, as the business district refused to stay where it had been, and shifted its location in response to numerous factors, although it generally stayed fairly compact – in the early 1930s even the largest took up less than 2% of the city's space, and most were significantly smaller – and remained
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7308-568: The Cordillera Isabelia , and the Cordillera de Talamanca . Between the mountain ranges lie fertile valleys that are suitable for the people; in fact, most of the population of Honduras, Costa Rica, and Guatemala live in valleys. Valleys are also suitable for the production of coffee, beans, and other crops. The indigenous peoples of the Americas have many creation myths , based on which they assert that they have been present on
7482-616: The Detroit Public Library and the Detroit Institute of Art , and most of the cultural institutions in Pittsburgh . Public reaction to these moves was mixed, with some bemoaning the loss of a counterbalance to the overall materialism of downtown, while others, particularly those involved in real estate, looked positively on the availability of the land which the cultural institutions left behind. The loss of
7656-465: The East Coast to eastern North Dakota , and stretching down to Kansas , is the humid continental climate featuring intense seasons, with a large amount of annual precipitation, with places like New York City averaging 50 in (1,300 mm). Starting at the southern border of the humid continental climate and stretching to the Gulf of Mexico (whilst encompassing the eastern half of Texas)
7830-788: The Great Depression had a major effect on the country's downtown area. Downtown was just coming off a major building boom, in which significant amounts of new commercial and office space, hotels, and department stores had been built. By 1931 there were 89 buildings of 30 stories or more in Manhattan, and between 1925 and 1931, office space nearly doubled; in Chicago, it increased by almost 75%, in Philadelphia by almost two-thirds, and by more than 50% in New Orleans and Denver. In
8004-493: The Interstate Highway System , and white flight from urban cores to rapidly expanding suburbs . Due to well-intended but ineptly executed urban revitalization projects, downtowns eventually came to be dominated by high-rise office buildings in which commuters from the suburbs filled white-collar jobs, while the remaining residential populations sank further into unemployment, poverty, and homelessness. By
8178-620: The Inuit of the high Arctic arrived in North America much later than other native groups, evidenced by the disappearance of Dorset culture artifacts from the archaeological record and their replacement by the Thule people . During the thousands of years of native habitation on the continent, cultures changed and shifted. One of the oldest yet discovered is the Clovis culture (c. 9550–9050 BCE) in modern New Mexico . Later groups include
8352-1143: The Metropolitan Museum of Art , the New-York Historical Society , the American Museum of Natural History and the Museum of the City of New York , all in Manhattan, moved out of downtown, as did the Museum of Fine Arts , the Boston Public Library , the Boston Symphony Orchestra , and the Massachusetts Historical Society in Boston, the Cleveland Museum of Art , the Baltimore Museum of Art ,
8526-719: The Mississippian culture and related Mound building cultures, found in the Mississippi River valley and the Pueblo culture of what is now the Four Corners . The more southern cultural groups of North America were responsible for the domestication of many common crops now used around the world, such as tomatoes, squash , and maize . As a result of the development of agriculture in the south, many other cultural advances were made there. The Mayans developed
8700-516: The United States . North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), representing approximately 16.5% of the Earth 's land area and 4.8% of its total surface area. It is the third-largest continent by size after Asia and Africa , and the fourth-largest continent by population after Asia, Africa, and Europe . As of 2021 , North America's population
8874-488: The first official name given to Mexico. North America includes several regions and subregions, each of which have their own respective cultural, economic, and geographic regions. Economic regions include several regions formalized in 20th- and 21st-century trade agreements, including NAFTA between Canada , Mexico , and the United States , and CAFTA between Central America , the Dominican Republic , and
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#17327655247259048-643: The " Seven Sisters ", were built between 1947 and 1953; and one, the Main building of Moscow State University , was the tallest building in Europe for nearly four decades (1953–1990). Other skyscrapers in the style of Socialist Classicism were erected in East Germany ( Frankfurter Tor ), Poland ( PKiN ), Ukraine ( Hotel Moscow ), Latvia ( Academy of Sciences ), and other Eastern Bloc countries. Western European countries also began to permit taller skyscrapers during
9222-402: The "Sun" that the outlying business districts revolved around. Others doubted whether decentralization had as strong an impact as it was credited with. Positions were taken that downtown was a natural part of the evolution of a city, or the unnatural result of a de facto conspiracy by merchants and property owners, so the question of what decentralization would do to downtown became bound up with
9396-460: The 10th century described as resembling minarets . Nasir Khusraw in the early 11th century described some of them rising up to 14 stories, with roof gardens on the top floor complete with ox-drawn water wheels for irrigating them. Cairo in the 16th century had high-rise apartment buildings where the two lower floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants . An early example of
9570-401: The 1490s, building cities, putting the resident indigenous populations to work, raising crops for Spanish settlers and panning gold to enrich the Spaniards. Much of the indigenous population died due to disease and overwork, spurring the Spaniards on to claim new lands and peoples. An expedition under the command of Spanish settler, Hernán Cortés , sailed westward in 1519 to what turned out to be
9744-465: The 1880s that had enabled construction of tall multi-story buildings. This definition was based on the steel skeleton—as opposed to constructions of load-bearing masonry , which passed their practical limit in 1891 with Chicago's Monadnock Building . What is the chief characteristic of the tall office building? It is lofty. It must be tall. The force and power of altitude must be in it, the glory and pride of exaltation must be in it. It must be every inch
9918-478: The 1890s and 1900s. The apparent lack of a height limitation of this type of building set off a fervent debate over whether their height should be restricted by law, with proponents and opponents of height limits bringing out numerous arguments in favor of their position. The question of height limits also had a profound implication for the nature of downtown itself: would it continue to be a concentrated core, or as it grew, would height limits force it to spread out into
10092-434: The 1920s, 500,000 additional hotel rooms were built in New York, and from 1927 to 1931 there were 84 large hotels built there, an increase of hotel space by two-thirds. When the boom was over, and the Depression had begun to have its effect, much of this new space became unneeded excess. Owners of smaller buildings who could not keep a sufficient number of tenants to pay their overhead, tore down their buildings, but whereas in
10266-410: The 1960s now use a tube design derived from Khan's structural engineering principles, examples including the construction of the World Trade Center , Aon Center , Petronas Towers , Jin Mao Building , and most other supertall skyscrapers since the 1960s. The strong influence of tube structure design is also evident in the construction of the current tallest skyscraper, the Burj Khalifa , which uses
10440-433: The 1960s, according to the CTBUH, the skyscraper has been reoriented away from a symbol for North American corporate power to instead communicate a city or nation's place in the world. Skyscraper construction entered a three-decades-long era of stagnation in 1930 due to the Great Depression and then World War II . Shortly after the war ended, Russia began construction on a series of skyscrapers in Moscow . Seven, dubbed
10614-588: The 1990s, many office-oriented businesses began to abandon the tired old downtowns for the suburbs, resulting in what are now known as " edge cities ". One textbook, in explaining why edge cities are so popular, stated: The big central city comes with dirt, crime, subways, stress, congestion, high taxes, and poor public schools. Edge cities are not immune to all of these problems (especially congestion) but for now they largely avoid most of them. Since then, between 2000 and 2010, downtown areas grew rapidly in population. In U.S. metro areas with at least five million people,
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#173276552472510788-807: The 26th century BC. It was not surpassed in height for thousands of years, the 160 m (520 ft) Lincoln Cathedral having exceeded it in 1311–1549, before its central spire collapsed. The latter in turn was not surpassed until the 555-foot (169 m) Washington Monument in 1884. However, being uninhabited, none of these structures actually comply with the modern definition of a skyscraper. High-rise apartments flourished in classical antiquity . Ancient Roman insulae in imperial cities reached 10 and more stories. Beginning with Augustus (r. 30 BC-14 AD), several emperors attempted to establish limits of 20–25 m for multi-stories buildings, but were met with only limited success. Lower floors were typically occupied by shops or wealthy families, with
10962-417: The 57 m (187 ft) tall 1924 Marx House in Düsseldorf , the 65 m (213 ft) tall Borsigturm in Berlin , built in 1924, the 65 m (213 ft) tall Hansahochhaus in Cologne , Germany, built in 1925; the 61 m (200 ft) Kungstornen (Kings' Towers) in Stockholm , Sweden, which were built 1924–25; the 77 m (253 ft) Ullsteinhaus in Berlin, Germany, built in 1927;
11136-403: The 89 m (292 ft) Edificio Telefónica in Madrid , Spain, built in 1929; the 87.5 m (287 ft) Boerentoren in Antwerp, Belgium, built in 1932; the 66 m (217 ft) Prudential Building in Warsaw , Poland, built in 1934; and the 108 m (354 ft) Torre Piacentini in Genoa , Italy, built in 1940. After an early competition between New York City and Chicago for
11310-462: The Arctic, making Canada one of the world's largest producers. Throughout the Shield, there are many mining towns extracting these minerals. The largest, and best known, is Sudbury , Ontario. Sudbury is an exception to the normal process of forming minerals in the Shield since there is significant evidence that the Sudbury Basin is an ancient meteorite impact crater . The nearby, but less-known Temagami Magnetic Anomaly has striking similarities to
11484-503: The CTBUH, is the distance between the highest floor and its architectural top (excluding antennae, flagpole or other functional extensions). Vanity height first appeared in New York City skyscrapers as early as the 1920s and 1930s but supertall buildings have relied on such uninhabitable extensions for on average 30% of their height, raising potential definitional and sustainability issues. The current era of skyscrapers focuses on sustainability , its built and natural environments, including
11658-478: The Caribbean islands. France took the western half of Hispaniola and developed Saint-Domingue as a cane sugar producing colony worked by black slave labor. Britain took Barbados and Jamaica , and the Dutch and Danes took islands previously claimed by Spain. Britain did not begin settling on the North American mainland until a hundred years after the first Spanish settlements, since it sought first to control nearby Ireland . The first permanent English settlement
11832-590: The Chicago Loop – although values in other parts of the city, including the outlying business districts, fared even worse. Department stores were hit hard; most managed to keep their doors open, but few made money. Hotels which needed to have large staffs, and required high occupancy rates to make a profit were also deeply affected; in Manhattan the hotel occupancy rate fell from 1929's 70% to around 50% in 1933. Room rates were slashed, revenue dropped, and many hotels closed or defaulted. By 1934, 80% of hotels in Manhattan were owned by their creditors. The slow recovery from
12006-418: The Cod fish", in reference to the abundance of cod fish on the East Coast . Waldseemüller used the Latin version of Vespucci's name, Americus Vespucius, in its feminine form of "America", following the examples of "Europa", "Asia", and "Africa". Americus originated from Medieval Latin Emericus (see Saint Emeric of Hungary ), coming from the Old High German name Emmerich . Map makers later extended
12180-485: The Manhattan model and continue to use downtown , midtown , and uptown both as informal relative geographical terms and as formal names for distinct districts. However, the city of Philadelphia uses the designation Center City , not downtown, due to the business district's central location, as well as Philadelphia's age and circumstances; "Center City" corresponds to the City of Philadelphia prior to its amalgamation with Philadelphia County in 1854 , leaving it without
12354-419: The North America's southeastern coast, Spanish explorer Juan Ponce de León , who had accompanied Columbus's second voyage, visited and named in 1513 La Florida . As the colonial period unfolded, Spain, England, and France appropriated and claimed extensive territories in North America eastern and southern coastlines. Spain established permanent settlements on the Caribbean islands of Hispaniola and Cuba in
12528-479: The Sudbury Basin. Its magnetic anomalies are very similar to the Sudbury Basin, and so it could be a second metal-rich impact crater. The Shield is also covered by vast boreal forests that support an important logging industry. The United States can be divided into twelve main geological provinces: Each province has its own geologic history and unique features. The geology of Alaska is typical of that of
12702-535: The U.S. North America occupies the northern portion of the landmass generally referred to as the New World, the Western Hemisphere , the Americas, or simply America, which, in many countries, is considered a single continent with North America a subcontinent . North America is the third-largest continent by area after Asia and Africa . North America's only land connection to South America
12876-470: The United States and Europe define skyscrapers as buildings at least 150 m (490 ft) in height or taller, with " supertall " skyscrapers for buildings higher than 300 m (984 ft) and " megatall " skyscrapers for those taller than 600 m (1,969 ft). The tallest structure in ancient times was the 146 m (479 ft) Great Pyramid of Giza in ancient Egypt , built in
13050-490: The United States has been the source of more varieties of dinosaurs than any other modern country. According to paleontologist Peter Dodson, this is primarily due to stratigraphy, climate and geography, human resources, and history. Much of the Mesozoic Era is represented by exposed outcrops in the many arid regions of the continent. The most significant Late Jurassic dinosaur-bearing fossil deposit in North America
13224-605: The United States, and Mexico. France , Italy , Portugal , Spain , Romania , Greece , and the countries of Latin America use a six-continent model , with the Americas viewed as a single continent and North America designating a subcontinent comprising Canada , the United States , Mexico, and Saint Pierre and Miquelon (politically part of France), and often including Greenland and Bermuda . North America has historically been known by other names, including Spanish North America, New Spain , and América Septentrional,
13398-579: The United States. North America is divided linguistically and culturally into two primary regions, Anglo-America and Latin America . Anglo-America includes most of North America, Belize , and Caribbean islands with English -speaking populations. There are also regions, including Louisiana and Quebec , with large Francophone populations; in Quebec , French is the official language. . The southern portion of North America includes Central America and non-English speaking Caribbean nations. The north of
13572-497: The amount of material that must be supported. This becomes inefficient and uneconomic for buildings above 40 stories tall as usable floor spaces are reduced for supporting column and due to more usage of steel. A new structural system of framed tubes was developed by Fazlur Rahman Khan in 1963. The framed tube structure is defined as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form
13746-547: The area had shifted to the Aztec Empire , whose capital city Tenochtitlan was located further north in the Valley of Mexico . The Aztecs were conquered in 1521 by Hernán Cortés . During the so-called Age of Discovery , Europeans explored overseas and staked claims to various parts of North America, much of which was already settled by indigenous peoples. Upon Europeans' arrival in the " New World ", indigenous peoples had
13920-527: The building profitable. What shattered that restriction was the invention of first the iron- and then the steel frame building, in which the building's load was carried by an internal metal frame skeleton, from which the masonry – and later glass – simply hung, without carrying any weight. Although first used in Chicago, the steel-framed skyscraper caught on most quickly in New York City in the 1880s, and from there spread to most other American cities in
14094-655: The cities themselves. Cities in the US grew much more slowly than during any other period in the history of the country, and some even lost population. Metropolitan regions grew faster than the cities inside them, indicating the start of the decades of urban sprawl , but they too grew at a slower pace than usual. Downtowns also had less daytime population because people now went to the outlying business districts, which were closer to their homes by car, for their shopping and entertainment, to do business, and to work. The increased use of automobiles over mass transit also damaged downtown, since
14268-462: The city, but allocated to downtown the primacy of being "central", not only geographically, in many cities, but also in importance. And in many cases, the downtown area or central business district, itself began to grow, such as in Manhattan where the business district lower Manhattan and the newer one in midtown began to grow towards each other, or in Chicago, where downtown expanded from the Loop across
14442-451: The city, had 20% of the city's land value. The same relationship was true in St. Louis in the mid-20s (20%) and Los Angeles in the early 1930s (17%). So when a downtown area started to shift its location, some property owners were bound to lose a great deal of money, while others would stand to gain. One way in which downtown changed from the late 19th century to the early part of the 20th century
14616-424: The classical designs of the early skyscrapers , instead embracing the uniform international style ; many older skyscrapers were redesigned to suit contemporary tastes or even demolished—such as New York's Singer Building , once the world's tallest skyscraper. German -American architect Ludwig Mies van der Rohe became one of the world's most renowned architects in the second half of the 20th century. He conceived
14790-493: The common New York City phrase "We're going to take the subway downtown", downtown refers to traveling in the geographic direction of south. A person standing on 121st Street and walking ten blocks south could also be said to have walked ten blocks downtown. The term uptown is used to refer to the cardinal direction north. Such concepts derive from Manhattan's elongated shape, running roughly north–south and nowhere more than 2 mi (3.2 km) wide. As such, transportation on
14964-432: The continent maintains recognized regions as well. In contrast to the common definition of North America, which encompasses the whole North American continent, the term "North America" is sometimes used more narrowly to refer only to four nations, Canada, Greenland, Mexico, and the U.S. The U.S. Census Bureau includes Saint Pierre and Miquelon, but excludes Mexico from its definition. The term Northern America refers to
15138-981: The continent's coasts; principally, the Arctic Archipelago, the Bahamas , Turks and Caicos , the Greater and Lesser Antilles , the Aleutian Islands (some of which are in the Eastern Hemisphere proper), the Alexander Archipelago , the many thousand islands of the British Columbia Coast, and Newfoundland. Greenland , a self-governing Danish island, and the world's largest , is on the same tectonic plate (the North American Plate ) and
15312-599: The continent. The vast majority of North America is on the North American Plate. Parts of western Mexico, including Baja California, and of California , including the cities of San Diego , Los Angeles , and Santa Cruz , lie on the eastern edge of the Pacific Plate , with the two plates meeting along the San Andreas Fault . The southernmost portion of the continent and much of the West Indies lie on
15486-659: The cordillera, while the major islands of Hawaii consist of Neogene volcanics erupted over a hot spot . Central America is geologically active with volcanic eruptions and earthquakes occurring from time to time. In 1976 Guatemala was hit by a major earthquake , killing 23,000 people; Managua, the capital of Nicaragua, was devastated by earthquakes in 1931 and 1972, the last one killing about 5,000 people; three earthquakes devastated El Salvador, one in 1986 and two in 2001; one earthquake devastated northern and central Costa Rica in 2009, killing at least 34 people; in Honduras
15660-648: The creation of a significant number of early skyscrapers, though none of these were steel reinforced and few remain today. Height limits and fire restrictions were later introduced. In the late 1800s, London builders found building heights limited due to issues with existing buildings. High-rise development in London is restricted at certain sites if it would obstruct protected views of St Paul's Cathedral and other historic buildings. This policy, 'St Paul's Heights', has officially been in operation since 1927. Concerns about aesthetics and fire safety had likewise hampered
15834-685: The cultures of the region commonly reflect Western traditions . However, relatively small parts of North America in Canada, the United States, Mexico, and Central America have indigenous populations that continue adhering to their respective pre-European colonial cultural and linguistic traditions. The Americas were named after the Italian explorer Amerigo Vespucci by German cartographers Martin Waldseemüller and Matthias Ringmann . Vespucci explored South America between 1497 and 1502, and
16008-418: The daytime population of the country's downtowns did not rebound. For instance, in Chicago between 1929 and 1949, the population of the city grew 7%, and that of the entire metropolitan area by about 14%, but the daytime population of The Loop only rose 1/3 of 1%. With a few exceptions, such as New York City, this pattern was typical across American cities, and was tied to the slowing down of the rate of growth of
16182-543: The decentralization of commerce which affected the importance and influence of downtown and the central business district. Theaters , vaudeville houses, dance halls and night clubs had been primarily located in downtown, with nickelodeons spread throughout the city. When film became the dominant medium, and exhibitors started to build movie theaters to show them in, they at first built those venues downtown as well, but, as in retail shopping, chain exhibitors such as Loews began to construct them in locations convenient to
16356-703: The development of skyscrapers across continental Europe for the first half of the 20th century. By 1940, there were around 100 high-rise buildings in Europe ( List of early skyscrapers ). Some examples of these are the 43 m (141 ft) tall 1898 Witte Huis (White House) in Rotterdam ; the 51.5 m (169 ft) tall PAST Building (1906–1908) in Warsaw ; the Royal Liver Building in Liverpool, completed in 1911 and 90 m (300 ft) high;
16530-702: The directionality of both words was lost, so that a Bostonian might refer to going "downtown", even though it was north of where they were. Downtown lay to the south in Detroit, but to the north in Cleveland, to the east in St. Louis, and to the west in Pittsburgh. In Boston, a resident pointed out in 1880, downtown was in the center of the city. Uptown was north of downtown in Cincinnati, but south of downtown in New Orleans and San Francisco. Notably, "downtown"
16704-504: The downtown area becoming a maze of dark streets that never saw the sun. Worse yet, at least from a real estate perspective, this new building created 1.2 million square feet (111,000 m) of office space, flooding into what was already a sluggish market. To many in the real estate industry, the zoning law was an example of a "reasonable restriction." Once New York had passed its law, other cities followed, although proposed zoning measures did meet stiff resistance in some places, often because of
16878-499: The downtown area was the business district of the American city, but beginning around the 1920s and 1930s, as cities continued to grow in size and population, rival business districts began to appear outside of downtown in outlying districts. This was the time when the term " central business district " began to appear as more-or-less synonymous with the downtown area. The phrase acknowledged the existence of other business districts in
17052-449: The downtown mix of businesses. Another sector which began to move away from downtown even before the turn of the 20th century were the great cultural institutions: museums, symphony halls, main libraries and so on. Not only was the high cost of land downtown a factor, but these institutions wanted larger plots of land than were available there, so that their buildings could themselves be easily perceived as works of art. Organizations such as
17226-447: The driest in the U.S. Highland climates cut from north to south of the continent, where subtropical or temperate climates occur just below the tropics, as in central Mexico and Guatemala . Tropical climates appear in the island regions and in the subcontinent's bottleneck, found in countries and states bathed by the Caribbean Sea or to the south of the Gulf of Mexico and the Pacific Ocean . Precipitation patterns vary across
17400-402: The early 1960s Bangladeshi-American structural engineer Fazlur Rahman Khan , considered the "father of tubular designs " for high-rises, discovered that the dominating rigid steel frame structure was not the only system apt for tall buildings, marking a new era of skyscraper construction in terms of multiple structural systems . His central innovation in skyscraper design and construction
17574-464: The early part of the 20th century, English travel writers felt it necessary to explain to their readers what "downtown" meant. Although American downtowns lacked legally-defined boundaries, and were often parts of several of the wards that most cities used as their basic functional district, locating the downtown area was not difficult, as it was the place where all the street railways and elevated railways converged, and – at least in most places – where
17748-534: The effects of the Great Depression began in the mid-1930s, decelerated at the end of the 1930s, and picked up speed with the start of World War II , so that by the early 1940s the country was for the most part out of the Depression. Excess commercial space began to be used, vacancy rates dropped, department store sales rose, hotel occupancy rates went up, and revenues increased. Despite this recovery,
17922-470: The end of the Canadian Shield, near the Great Lakes . Climate west of the Cascade Range is described as being temperate weather with average precipitation 20 inches (510 millimeters). Climate in coastal California is described to be Mediterranean , with average temperatures in cities like San Francisco ranging from 57 to 70 °F (14 to 21 °C) over the course of the year. Stretching from
18096-416: The environment and loaded structures with decorative elements and extravagant finishes. This approach to design was opposed by Fazlur Khan and he considered the designs to be whimsical rather than rational. Moreover, he considered the work to be a waste of precious natural resources. Khan's work promoted structures integrated with architecture and the least use of material resulting in the smallest impact on
18270-454: The environment. The next era of skyscrapers will focus on the environment including performance of structures, types of material, construction practices, absolute minimal use of materials/natural resources, embodied energy within the structures, and more importantly, a holistically integrated building systems approach. Modern building practices regarding supertall structures have led to the study of "vanity height". Vanity height, according to
18444-492: The exact amount depending on what zone the building was in. The ultimate effect of setbacks is to increase the sunlight and visible sky at street level. New York City was the first to do this, with the 1916 Zoning Resolution , which was prompted in large part by the construction of the Equitable Building in 1915. The Equitable Building was a 40-story building with straight sides and no setbacks, which raised fears of
18618-562: The first American inhabitants sailed from Beringia some 13,000 years ago, with widespread habitation of the Americas during the end of the Last Glacial Period , in what is known as the Late Glacial Maximum , around 12,500 years ago. The oldest petroglyphs in North America date from 15,000 to 10,000 years before present. Genetic research and anthropology indicate additional waves of migration from Asia via
18792-473: The first building in the world to feature a metal-framed glass curtain wall , a design element which creates light, airy interiors and has since been used the world over as a defining feature of skyscrapers". Further developments led to what many individuals and organizations consider the world's first skyscraper, the ten-story Home Insurance Building in Chicago, built in 1884–1885. While its original height of 42.1 m (138 ft) does not even qualify as
18966-911: The geographic center of either the 50 states, the conterminous United States, or the North American continent." Nonetheless, there is a 4.6-meter (15 ft) field stone obelisk in Rugby claiming to mark the center. The North American continental pole of inaccessibility is located 1,650 km (1,030 mi) from the nearest coastline, between Allen and Kyle, South Dakota at 43°22′N 101°58′W / 43.36°N 101.97°W / 43.36; -101.97 ( Pole of Inaccessibility North America ) . Canada can be divided into roughly seven physiographic divisions: The lower 48 U.S. states can be divided into roughly eight physiographic divisions: Mexico can be divided into roughly fifteen physiographic divisions: North America
19140-479: The glass façade skyscraper and, along with Norwegian Fred Severud , designed the Seagram Building in 1958, a skyscraper that is often regarded as the pinnacle of modernist high-rise architecture. Skyscraper construction surged throughout the 1960s. The impetus behind the upswing was a series of transformative innovations which made it possible for people to live and work in "cities in the sky". In
19314-474: The growth of the chain stores, to the detriment of the big downtown department stores. Furthermore, the "taxpayers", which many people had expected to disappear once the economy improved, remained in place, and even increased in number. In the Loop in Chicago, by the early 1940s, 18% of the land was vacant or was used for parking; in Los Angeles at the same time, the figure was 25%. Demand for commercial space
19488-473: The hundred-story John Hancock Center and the massive 442 m (1,450 ft) Willis Tower . Other pioneers of this field include Hal Iyengar , William LeMessurier , and Minoru Yamasaki , the architect of the World Trade Center . Many buildings designed in the 70s lacked a particular style and recalled ornamentation from earlier buildings designed before the 50s. These design plans ignored
19662-499: The inclusion of overly restrictive height limits, and sometimes because the entire concept of zoning was seen as undemocratic and bordering on socialism . Eventually, a model law, the Standard State Zoning Enabling Act of 1922 was drawn up for the guidance of cities wishing to enact zoning regulations, which are now part of virtually every American city. During the late 19th and early 20th centuries,
19836-419: The indigenous people who lived there, including the bison hunters of the Great Plains and the farmers of Mesoamerica . Native groups also are classified by their language families , which included Athapascan and Uto-Aztecan languages. Indigenous peoples with similar languages did not always share the same material culture , however, and were not necessarily always allies. Anthropologists speculate that
20010-478: The island travels in the uptown/downtown directions. The other boroughs are wider, and "downtown" there refers to Lower Manhattan, Downtown Brooklyn , or some more local business district. Mercantile efforts to promote the South Bronx as "Downtown Bronx" have met with little success. In some North American cities, downtown is the formal name of the neighborhood in which the city's central business district
20184-468: The land since its creation, but there is no evidence that humans evolved there. The specifics of the initial settlement of the Americas by ancient Asians are subject to ongoing research and discussion. The traditional theory has been that hunters entered the Bering Land Bridge between eastern Siberia and present-day Alaska from 27,000 to 14,000 years ago. A growing viewpoint is that
20358-454: The lower levels of a skyscraper will be much larger than the material required within higher levels. This is not always visually apparent. The Empire State Building 's setbacks are actually a result of the building code at the time ( 1916 Zoning Resolution ), and were not structurally required. On the other hand, John Hancock Center 's shape is uniquely the result of how it supports loads. Vertical supports can come in several types, among which
20532-714: The mainland in Mexico. With local indigenous allies, the Spanish conquered the Aztec empire in central Mexico in 1521. Spain then established permanent cities in Mexico, Central America, and Spanish South America in the sixteenth century. Once Spaniards conquered the high civilization of the Aztecs and Incas, the Caribbean was a backwater of the Spanish empire. Other European powers began to intrude on areas claimed by Spain, including
20706-446: The major cultural institutions left downtown as a place primarily dedicated to business, but the loss of another sector, retail shopping, defined the type of business that was done there. The great retail outlets like the department stores had always had the tendency to move closer to the residential districts, to make it easier for their customers to get to them, but after 1920 they started to congregate in secondary business districts on
20880-515: The major cultural institutions, much of the retail shopping in the city, and its loss of status as the entertainment center, the nature of downtown had changed considerably. It was still the location of banks, stocks and commodity exchanges, law and accounting firms, the headquarters of the major industrial concerns and public utilities, insurance companies, and advertising agencies, and in its confines continued to be built new and taller skyscrapers housing offices, hotels and even department stores, but it
21054-408: The mass audience they were seeking; again, it was a matter of bringing their product to where the people were. By the late 1920s, movie houses outside of downtown far outnumbered those in the central district. Not all the movie theaters in the periphery were palaces , but some were, and the net effect was that downtown was no longer the entertainment center of the city. With the loss of manufacturing,
21228-927: The middle into the main range of the Rockies and the coast ranges in California , Oregon , Washington , and British Columbia , with the Great Basin—a lower area containing smaller ranges and low-lying deserts—in between. The highest peak is Denali in Alaska. The U.S. Geographical Survey (USGS) states that the geographic center of North America is "6 miles [10 km] west of Balta, Pierce County, North Dakota " at about 48°10′N 100°10′W / 48.167°N 100.167°W / 48.167; -100.167 , about 24 kilometers (15 mi) from Rugby, North Dakota . The USGS further states that "No marked or monumented point has been established by any government agency as
21402-674: The most common for skyscrapers can be categorized as steel frames, concrete cores, tube within tube design, and shear walls. The wind loading on a skyscraper is also considerable. In fact, the lateral wind load imposed on supertall structures is generally the governing factor in the structural design. Wind pressure increases with height, so for very tall buildings, the loads associated with wind are larger than dead or live loads. Other vertical and horizontal loading factors come from varied, unpredictable sources, such as earthquakes. By 1895, steel had replaced cast iron as skyscrapers' structural material. Its malleability allowed it to be formed into
21576-435: The most complex encountered given the balances required between economics , engineering , and construction management. One common feature of skyscrapers is a steel framework from which curtain walls are suspended, rather than load-bearing walls of conventional construction. Most skyscrapers have a steel frame that enables them to be built taller than typical load-bearing walls of reinforced concrete. Skyscrapers usually have
21750-454: The name America to North America. In 1538, Gerardus Mercator used the term America on his world map of the entire Western Hemisphere . On his subsequent 1569 map , Mercator called North America "America or New India" ( America sive India Nova ). The Spanish Empire called its territories in North and South America "Las Indias", and the name given to the state body that oversaw the region
21924-493: The northernmost countries and territories of North America: the U.S., Bermuda , Canada, Greenland, and St. Pierre and Miquelon. Although the term does not refer to a unified region, Middle America includes Mexico, Central America, and the Caribbean. North America's largest countries by land area are Canada and the U.S., both of which have well-defined and recognized subregions. In Canada, these include (from east to west) Atlantic Canada , Central Canada , Canadian Prairies ,
22098-440: The northernmost extent of the island named Newfoundland , has provided unmistakable evidence of Norse settlement. Norse explorer Leif Erikson (c. 970–1020 CE) is thought to have visited the area. Erikson was the first European to make landfall on the continent (excluding Greenland). The Mayan culture was still present in southern Mexico and Guatemala when the Spanish conquistadors arrived, but political dominance in
22272-426: The original town – which was also New York's only major center of business at the time – became known as "downtown" ( Lower Manhattan ). During the late 19th century, the term was gradually adopted by cities across the United States to refer to the historical core of the city, which was most often the same as the commercial heart of the city. "Uptown" also spread, but to a much lesser extent. In both cases, though,
22446-406: The performance of structures, types of materials, construction practices, absolute minimal use of materials and natural resources, energy within the structure, and a holistically integrated building systems approach. LEED is a current green building standard. Architecturally, with the movements of Postmodernism , New Urbanism and New Classical Architecture , that established since the 1980s,
22620-502: The periphery of the city. The growth of chain stores such as J. C. Penney , F. W. Woolworth , Kresge and W. T. Grant , contributed to the increased importance of the outlying shopping districts, which began outselling those retail stores which had remained in the central business district, and provoked those stores to open branches in the secondary districts in attempt to go to where there customers were instead of having them come downtown to them. Entertainment venues also contributed to
22794-413: The population within two miles of the city hall grew twice as fast as the overall population in the metro area. The terms downtown and uptown can refer to cardinal directions , for example, in Manhattan, where downtown is also a relative geographical term. Anything south of where the speaker is currently standing, in most places, is said to be downtown . Anything north of the speaker is uptown . In
22968-728: The price of steel decreased and labor costs increased. The steel frames become inefficient and uneconomic for supertall buildings as usable floor space is reduced for progressively larger supporting columns. Since about 1960, tubular designs have been used for high rises. This reduces the usage of material (more efficient in economic terms – Willis Tower uses a third less steel than the Empire State Building) yet allows greater height. It allows fewer interior columns, and so creates more usable floor space. It further enables buildings to take on various shapes. Elevators are characteristic to skyscrapers. In 1852 Elisha Otis introduced
23142-523: The primary business district of the city. Real estate interests were particularly concerned about the tendency of downtown to move because the downtown area had by far the highest land values in each city. One commentator said that if Chicago's land values were shown as height on a relief map, the Loop would be equivalent to the peaks of the Himalayas compared to the rest of the city. In 1926, Chicago's central business district, which took up less than 1% of
23316-589: The question about the area's legitimacy. Decentralization also increased the incidences of rivalry between downtown and burgeoning business districts. In Los Angeles, for instance, downtown and Wilshire Boulevard battled for dominance, and in Cincinnati the rivalry was between the old downtown centered around Fountain Square and the one on Canal Street. The diminishment of downtown by decentralization caused these battles to be between areas that were now more relatively equal. Like almost every other aspect of American life,
23490-447: The railroad terminals were. It was the location of the great department stores and hotels, as well as that of theaters, clubs, cabarets, and dance halls, and where skyscrapers were built once that technology was perfected. It was also frequently, at first, the only part of a city that was electrified. It was also the place where street congestion was the worst, a problem for which a solution was never really found. But most of all, downtown
23664-605: The raised but relatively flat plateau of the Canadian Shield in the northeast; and the varied eastern region, which includes the Appalachian Mountains, the coastal plain along the Atlantic seaboard, and the Florida peninsula. Mexico, with its long plateaus and cordilleras , falls largely in the western region, although the eastern coastal plain does extend south along the Gulf. The western mountains are split in
23838-520: The recent past they would have been replaced with taller buildings, now they became one- and two-story parking garages or ground-level parking lots. These were widely known as "taxpayers", as they generated enough revenue for the owner of the lot to pay the taxes on it. Rents fell, sometimes as much as 30%, and non-payment of rent increased. Even with the "taxpayers" taking away commercial space, vacancy rates rose precipitously. Owners went into default, and downtown real estate lost considerable value: 25–30% in
24012-500: The region, and as such rainforest , monsoon , and savanna types can be found, with rains and high temperatures throughout the year. Notable North American fauna include the bison , black bear , jaguar , cougar , prairie dog , turkey , pronghorn , raccoon , coyote , and monarch butterfly . Notable plants that were domesticated in North America include tobacco , maize , squash , tomato , sunflower , blueberry , avocado , cotton , chile pepper , and vanilla . Laurentia
24186-487: The results of the formation of Pangaea was the Appalachian Mountains , which formed some 480 mya, making it among the oldest mountain ranges in the world. When Pangaea began to rift around 200 mya, North America became part of Laurasia , before it separated from Eurasia as its own continent during the mid- Cretaceous period. The Rockies and other western mountain ranges began forming around this time from
24360-429: The rise of the private automobile, which allowed shoppers to go to peripheral business districts more easily; a strong increase in streetcar fares; and the continuing problem of congestion in the narrow streets of the downtown area. As much as people disagreed about what caused decentralization, they were even less in agreement about how decentralization would affect the central business district, with opinions varying all
24534-484: The safety elevator at the E. V. Haughwout Building in New York City, allowing convenient and safe transport to buildings' upper floors. Otis later introduced the first commercial passenger elevators to the Equitable Life Building in 1870, considered by some architectural historians to be the first skyscraper. Another crucial development was the use of a steel frame instead of stone or brick, otherwise
24708-643: The safety elevator, allowing convenient and safe passenger movement to upper floors. Another crucial development was the use of a steel frame instead of stone or brick, otherwise the walls on the lower floors on a tall building would be too thick to be practical. Today major manufacturers of elevators include Otis , ThyssenKrupp , Schindler , and KONE . Advances in construction techniques have allowed skyscrapers to narrow in width, while increasing in height. Some of these new techniques include mass dampers to reduce vibrations and swaying, and gaps to allow air to pass through, reducing wind shear. Good structural design
24882-421: The streetcar lines converged on downtown, while the roads went everywhere. All of these factors contributed to the lesser recovery of downtown relative to the city as a whole and the metropolitan area. Another sign that downtowns were no longer as central to city life as they once were include the decreased portion of retail trade that took place there as compared to the peripheral business areas, which profited by
25056-438: The title for six years. The design and construction of skyscrapers involves creating safe, habitable spaces in very tall buildings. The buildings must support their weight, resist wind and earthquakes, and protect occupants from fire. Yet they must also be conveniently accessible, even on the upper floors, and provide utilities and a comfortable climate for the occupants. The problems posed in skyscraper design are considered among
25230-407: The town of New York grew into a city, the only direction it could grow on the island was toward the north , proceeding upriver from the original settlement, the "up" and "down" terminology coming from the customary map design in which up was north and down was south . Thus, anything north of the original town became known as " uptown " ( Upper Manhattan ), and was generally a residential area, while
25404-715: The tube frame must be interrupted, with transfer girders used to maintain structural integrity. Tube structures cut down costs, at the same time allowing buildings to reach greater heights. Concrete tube-frame construction was first used in the DeWitt-Chestnut Apartment Building , completed in Chicago in 1963, and soon after in the John Hancock Center and World Trade Center . The tubular systems are fundamental to tall building design. Most buildings over 40 stories constructed since
25578-482: The tube structure was the Chestnut De-Witt apartment building, considered to be a major development in modern architecture. These new designs opened an economic door for contractors, engineers, architects, and investors, providing vast amounts of real estate space on minimal plots of land. Over the next fifteen years, many towers were built by Fazlur Rahman Khan and the " Second Chicago School ", including
25752-478: The upper rented to the lower classes. Surviving Oxyrhynchus Papyri indicate that seven-stories buildings existed in provincial towns such as in 3rd century AD Hermopolis in Roman Egypt . The skylines of many important medieval cities had large numbers of high-rise urban towers, built by the wealthy for defense and status. The residential Towers of 12th century Bologna numbered between 80 and 100 at
25926-465: The walls on the lower floors on a tall building would be too thick to be practical. An early development in this area was Oriel Chambers in Liverpool , England, built in 1864. It was only five floors high. The Royal Academy of Arts states, "critics at the time were horrified by its 'large agglomerations of protruding plate glass bubbles'. In fact, it was a precursor to Modernist architecture, being
26100-436: The way from the belief that it would diminish downtown sufficiently that it would eventually consist of only offices and the headquarters of corporate giants, to the belief that decentralization would lead to the (perhaps deserved) death of downtown entirely as unnecessary, a victim of its untameable traffic congestion. In between were those who saw a diminishment of the area's influence, but not enough to prevent it from remaining
26274-569: The weight of the building. This development led to the "Chicago skeleton" form of construction. In addition to the steel frame, the Home Insurance Building also utilized fireproofing, elevators, and electrical wiring, key elements in most skyscrapers today. Burnham and Root 's 45 m (148 ft) Rand McNally Building in Chicago, 1889, was the first all-steel framed skyscraper, while Louis Sullivan 's 41 m (135 ft) Wainwright Building in St. Louis, Missouri, 1891,
26448-814: The world have more than 100 skyscrapers that are 150 m (492 ft) or taller: Hong Kong with 552 skyscrapers; Shenzhen , China with 373 skyscrapers; New York City , US with 314 skyscrapers; Dubai , UAE with 252 skyscrapers; Guangzhou , China with 188 skyscrapers; Shanghai , China with 183 skyscrapers; Tokyo , Japan with 168 skyscrapers; Kuala Lumpur , Malaysia with 156 skyscrapers; Wuhan , China with 149 skyscrapers; Chongqing , China, with 144 skyscrapers; Chicago , US, with 137 skyscrapers; Chengdu , China with 117 skyscrapers; Jakarta , Indonesia , with 112 skyscrapers; Bangkok , Thailand , with 111 skyscrapers, and Mumbai , India with 102. As of 2024, there are over 7 thousand skyscrapers over 150 m (492 ft) in height worldwide. The term "skyscraper"
26622-664: The world's tallest building for forty years. The first completed 417 m (1,368 ft) tall World Trade Center tower became the world's tallest building in 1972. However, it was overtaken by the Sears Tower (now Willis Tower ) in Chicago within two years. The 442 m (1,450 ft) tall Sears Tower stood as the world's tallest building for 24 years, from 1974 until 1998, until it was edged out by 452 m (1,483 ft) Petronas Twin Towers in Kuala Lumpur, which held
26796-432: The world's tallest building, New York took the lead by 1895 with the completion of the 103 m (338 ft) tall American Surety Building , leaving New York with the title of the world's tallest building for many years. Modern skyscrapers are built with steel or reinforced concrete frameworks and curtain walls of glass or polished stone . They use mechanical equipment such as water pumps and elevators . Since
26970-476: The world, although only partially iron framed, is The Flaxmill in Shrewsbury , England. Built in 1797, it is seen as the "grandfather of skyscrapers", since its fireproof combination of cast iron columns and cast iron beams developed into the modern steel frame that made modern skyscrapers possible. In 2013 funding was confirmed to convert the derelict building into offices. In 1857, Elisha Otis introduced
27144-671: The years immediately following World War II. Early examples include Edificio España (Spain) and Torre Breda (Italy). From the 1930s onward, skyscrapers began to appear in various cities in East and Southeast Asia as well as in Latin America . Finally, they also began to be constructed in cities in Africa , the Middle East , South Asia , and Oceania from the late 1950s. Skyscraper projects after World War II typically rejected
27318-417: Was assumed that people would climb, but with the elevator, that limit was shattered, and buildings began to be constructed up to about sixteen stories. What limited them then was the thickness of the masonry needed at the base to hold the weight of the building above it. As the buildings got taller, the thickness of the masonry and the space needed for elevators did not allow for sufficient rentable space to make
27492-549: Was called the Council of the Indies . The United Nations and its statistics division recognize North America as including three regions: Northern America, Central America , and the Caribbean . "Northern America" is a distinct term from "North America", excluding Central America, which itself may or may not include Mexico . In the limited context of regional trade agreements, the term is used to reference three nations: Canada,
27666-420: Was considerably cheaper than downtown, property taxes were lower, transportation of supplies and finished products was much easier without the constant congestion emblematic of downtown, and with the improvement of the telephone system, the industrial firms could still keep in touch with the companies they did business with elsewhere. As a result of this migration, manufacturing was no longer a significant part of
27840-409: Was done downtown, those who had their homes there were gradually pushed out, selling their property and moving to quieter residential areas uptown. The skyscraper would become the hallmark of the downtown area. Prior to the invention of the elevator – and later the high-speed elevator – buildings were limited in height to about six stories, which was a de facto limit set by the amount of stairs it
28014-458: Was estimated as over 592 million people in 23 independent states , or about 7.5% of the world's population. In human geography , the terms "North America" and "North American" can refer to Canada, the United States, Mexico, and Greenland or, alternatively, Canada, Greenland and the US (Mexico being classified as part of Latin America ) or simply Canada and the US (Greenland being classified as either Arctic or European (due to its political status as
28188-621: Was first applied to buildings of steel-framed construction of at least 10 stories in the late 19th century, a result of public amazement at the tall buildings being built in major American cities like New York City , Philadelphia , Boston , Chicago , Detroit , and St. Louis . The first steel-frame skyscraper was the Home Insurance Building , originally 10 stories with a height of 42 m or 138 ft, in Chicago in 1885; two additional stories were added. Some point to Philadelphia's 10-story Jayne Building (1849–50) as
28362-817: Was in Jamestown, Virginia in 1607, followed by additional colonial establishments on the east coast from present-day Georgia in the south to Massachusetts in the north, forming the Thirteen Colonies of British America. The English did not establish settlements north or east of the St. Lawrence Valley in present-day Canada until after the conclusion of the American Revolutionary War . Britain's early settlements in present-day Canada included St. John's, Newfoundland in 1630 and Halifax, Nova Scotia in 1749. The first permanent French settlement
28536-531: Was in Quebec City, Quebec in 1608 Skyscraper A skyscraper is a tall continuously habitable building having multiple floors. Modern sources define skyscrapers as being at least 100 meters (330 ft) or 150 meters (490 ft) in height, though there is no universally accepted definition, other than being very tall high-rise buildings . Skyscrapers may host offices, hotels, residential spaces, and retail spaces. One common feature of skyscrapers
28710-424: Was in 17th-century Edinburgh , Scotland, where a defensive city wall defined the boundaries of the city. Due to the restricted land area available for development, the houses increased in height instead. Buildings of 11 stories were common, and there are records of buildings as high as 14 stories. Many of the stone-built structures can still be seen today in the old town of Edinburgh. The oldest iron framed building in
28884-423: Was no longer as dominant as it once was. The causes of decentralization, which decreased the importance of downtown in the life of American cities, have been ascribed to many factors, including each city's normal growth patterns; advances in technology like the telephone, which made it easier for business-to-business intercourse to take place over a distance, thus lessening the need for a centralized commercial core;
29058-526: Was not included in dictionaries as late as the 1880s. But by the early 1900s, "downtown" was clearly established as the proper term in American English for a city's central business district, although the word was virtually unknown in Britain and Western Europe, where expressions such as "city centre" (British English), "el centro" (Spanish), "das Zentrum" (German), etc are used. Even as late as
29232-460: Was so light that it did not make financial sense to construct expensive new buildings, and banks began to refuse to make loans for that purpose, redlining whole neighborhoods in the central business district. The typical American downtown has certain unique characteristics. During the postwar economic boom in the 1950s , the residential population of most downtowns crashed. This has been attributed to reasons such as slum clearance , construction of
29406-406: Was still steadily losing ground as decentralization took its toll. Its daytime population was not keeping pace with the population growth of the city around it, and property values, while continuing to rise, were not rising as fast as those in the secondary business districts. Downtown was still the central business district, and was still the most important area for doing business and commerce, but it
29580-424: Was that industrial concerns began to leave downtown and move to the periphery of the city, which meant that downtown's businesses were chiefly part of the burgeoning service sector . Brand new firms followed the older ones, and never came to downtown, settling at the edges of the city or the urban area. Industrial districts developed in these areas, which were sometimes specifically zoned for manufacturing. There, land
29754-454: Was the concept of the "tube" structural system , including the "framed tube", "trussed tube", and "bundled tube". His "tube concept", using all the exterior wall perimeter structure of a building to simulate a thin-walled tube, revolutionized tall building design. These systems allow greater economic efficiency, and also allow skyscrapers to take on various shapes, no longer needing to be rectangular and box-shaped. The first building to employ
29928-613: Was the first steel-framed building with soaring vertical bands to emphasize the height of the building and is therefore considered to be the first early skyscraper. In 1889, the Mole Antonelliana in Italy was 197 m (549 ft) tall. Most early skyscrapers emerged in the land-strapped areas of New York City and Chicago toward the end of the 19th century. A land boom in Melbourne , Australia between 1888 and 1891 spurred
30102-473: Was the first European to suggest that the Americas represented a landmass not then known to the Europeans. In 1507, Waldseemüller published a world map, and placed the word "America" on the continent of present-day South America. The continent north of present-day Mexico was then referred to as Parias. On a 1553 world map published by Petrus Apianus , North America was called "Baccalearum", meaning "realm of
30276-420: Was the place where the city did its business. Inside its small precincts, sometimes as small as several hundred acres, the majority of the trading, selling, and purchasing – retail and wholesale – in the entire area would take place. There were hubs of business in other places around the city and its environs, but the downtown area was the chief one, truly the central business district. And as more and more business
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