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138-681: Josiah White (1781–1850) was a Pennsylvania industrialist and key figure in the American Industrial Revolution . White began early factory-centered mill production in 1808 in water powered ironworks near Philadelphia , along with his partner, Erskine Hazard , when they quickly found their first mill at East Falls, Pennsylvania , to be much too small. They then built a more elaborate and larger mill nearby to refine pig iron and produce cast iron artifacts and roll wrought bar iron goods, including nails and wire. The pair were especially influential after 1814 in helping make
276-408: A steam engine replaced a horse-powered pump in 1742. Such engines were used to pump water to a reservoir above the furnace. The first engines used to blow cylinders directly was supplied by Boulton and Watt to John Wilkinson 's New Willey Furnace. This powered a cast iron blowing cylinder , which had been invented by his father Isaac Wilkinson . He patented such cylinders in 1736, to replace
414-1045: A Farmer in Pennsylvania, To the Inhabitants of the British Colonies , which were published in the Pennsylvania Chronicle between December 2, 1767, and February 15, 1768. When the Founding Fathers convened in Philadelphia in 1774, 12 colonies sent representatives to the First Continental Congress . The Second Continental Congress , which began in May 1775, authored and signed the Declaration of Independence in Philadelphia, but when Philadelphia fell to
552-542: A blast furnace to melt the iron and remove the gangue (impurities) unless the ore is very high quality. The oxygen blast furnace (OBF) process has been extensively studied theoretically because of the potentials of promising energy conservation and CO 2 emission reduction. This type may be the most suitable for use with CCS. The main blast furnace has of three levels; the reduction zone (523–973 K (250–700 °C; 482–1,292 °F)), slag formation zone (1,073–1,273 K (800–1,000 °C; 1,472–1,832 °F)), and
690-413: A bloomery does not. Another difference is that bloomeries operate as a batch process whereas blast furnaces operate continuously for long periods. Continuous operation is also preferred because blast furnaces are difficult to start and stop. Also, the carbon in pig iron lowers the melting point below that of steel or pure iron; in contrast, iron does not melt in a bloomery. Silica has to be removed from
828-766: A century, the Pennsylvania General Assembly met at various places in the Philadelphia area before it began meeting regularly in Independence Hall in Philadelphia for 63 years. However, events such as the Paxton Boys massacres of 1763 had made the legislature aware of the need for a central capital. In 1799, the General Assembly moved to the Lancaster Courthouse. The Pennsylvania General Assembly met in
966-520: A grant that incorporated all lands included in the original Virginia Company of Plymouth Grant and other lands. This grant was in conflict with the Dutch claim for New Netherland , which included parts of today's Pennsylvania. On June 24, 1664, the Duke of York sold the portion of his large grant that included present-day New Jersey to John Berkeley and George Carteret for a proprietary colony. The land
1104-451: A heavy snowstorm, presumably because of a faulty flue . The General Assembly met at a nearby Methodist Church until a new capitol could be built. Following an architectural selection contest, Chicago architect Henry Ives Cobb was asked to design and build a replacement building. However, the legislature had little money to allocate to the project. When they dubbed the roughly finished, somewhat industrial Cobb Capitol building complete,
1242-457: A leader in technology and healthcare. Similarly, Philadelphia has a concentration of university expertise. Healthcare, retail, transportation, and tourism are some of the state's growing industries of the postindustrial era. As in the rest of the nation, most residential population growth has occurred in suburban rather than central city areas, although both major cities have had significant revitalization in their downtown areas. Philadelphia anchors
1380-484: A minor branch of the industry, but Darby's son built a new furnace at nearby Horsehay, and began to supply the owners of finery forges with coke pig iron for the production of bar iron. Coke pig iron was by this time cheaper to produce than charcoal pig iron. The use of a coal-derived fuel in the iron industry was a key factor in the British Industrial Revolution . However, in many areas of
1518-455: A model factory, often as large as the church and only several feet away, and waterpower drove the machinery of the various industries located on its floor." Iron ore deposits were often donated to the monks along with forges to extract the iron, and after a time surpluses were offered for sale. The Cistercians became the leading iron producers in Champagne , France, from the mid-13th century to
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#17327804019371656-527: A regular supply of coal to customers in Philadelphia. In short order they obtained an option on leasing the mining and other rights held by the despondent owners of the LCMC, and began activities promoting the venture. No sooner had White, Hazard, and Hauto obtained a lease of the coal lands in what is now Mauch Chunk than they applied to the Legislature for an act authorizing them to improve the navigation of
1794-556: A succession of fireplace and furnace grates until he created artifacts allowing use of the stone coal to replace expensive fire wood for heating. In 1818 White's wire works built the first (temporary) wire suspension bridge 120 metres (400 ft) over the Falls of the Schuylkill using trees and tall buildings near the river to string catenary cables from which a board walk was suspended attached by wires. Ever looking for better ways in
1932-541: Is believed to have produced cast iron quite efficiently. Its date is not yet clear, but it probably did not survive until Henry VIII 's Dissolution of the Monasteries in the late 1530s, as an agreement (immediately after that) concerning the "smythes" with the Earl of Rutland in 1541 refers to blooms. Nevertheless, the means by which the blast furnace spread in medieval Europe has not finally been determined. Due to
2070-849: Is in Duncannon in Perry County . According to the U.S. Department of Housing and Urban Development 's 2022 Annual Homeless Assessment Report , there were an estimated 12,691 homeless people in Pennsylvania. Among Pennsylvania residents, as of 2020, nearly three out of four, 74.5%, are native to the state and were born in Pennsylvania, 18.4% were born in a different U.S. state, 1.5% were born in Puerto Rico , U.S. Island areas, or born abroad to American parent(s), and 5.6% were foreign born. Foreign-born Pennsylvanians are largely from Asia (36.0%), Europe (35.9%), and Latin America (30.6%) with
2208-556: Is located in Fengxiang County , Shaanxi (a museum exists on the site today). There is however no evidence of the bloomery in China after the appearance of the blast furnace and cast iron. In China, blast furnaces produced cast iron, which was then either converted into finished implements in a cupola furnace, or turned into wrought iron in a fining hearth. Although cast iron farm tools and weapons were widespread in China by
2346-464: Is possible that the technology reached Sweden by this means. The Vikings are known to have used double bellows, which greatly increases the volumetric flow of the blast. The Caspian region may also have been the source for the design of the furnace at Ferriere , described by Filarete , involving a water-powered bellows at Semogo in Valdidentro in northern Italy in 1226. In a two-stage process
2484-610: Is the 33rd-largest by area and has the ninth-highest population density among all states. The largest metropolitan statistical area is the southeastern Delaware Valley , which includes and surrounds Philadelphia, the state's largest and nation's sixth-most populous city. The second-largest metropolitan area, Greater Pittsburgh , is centered in and around Pittsburgh , the state's second-largest city. The state's subsequent five most populous cities are Allentown , Reading , Erie , Scranton , and Bethlehem . Pennsylvania's history of human habitation extends thousands of years before
2622-464: Is the fifth-most populated state in the U.S. after California , Texas , Florida , and New York . In 2019, net migration to other states resulted in a decrease of 27,718, and immigration from other countries resulted in an increase of 127,007. Net migration to Pennsylvania was 98,289. Migration of native Pennsylvanians resulted in a decrease of 100,000 people. 7.2% of the population was foreign-born as of 2021. Pennsylvania's center of population
2760-408: Is used to make cast iron . The majority of pig iron produced by blast furnaces undergoes further processing to reduce the carbon and sulphur content and produce various grades of steel used for construction materials, automobiles, ships and machinery. Desulphurisation usually takes place during the transport of the liquid steel to the steelworks. This is done by adding calcium oxide , which reacts with
2898-408: The American Industrial Revolution accelerate its building momentum by agitating for infrastructure investment, sponsoring two key river navigations and the nation's first long railway, and then after initial success, increasingly supplying an expanding part of the country's overall energy needs including that of other industrialists at a time when there occurred the prolonged first energy crisis in
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#17327804019373036-865: The British in the Philadelphia campaign , the Continental Congress moved west, where it met at the Lancaster courthouse on Saturday, September 27, 1777, and then to York . In York, the Second Continental Congress adopted the Articles of Confederation , largely authored by Pennsylvania delegate John Dickinson, that formed 13 independent States into a new union. Later, the Constitution was written, and Philadelphia
3174-474: The Canadian province of Ontario to its northwest via Lake Erie . Pennsylvania was founded in 1681 through a royal land grant to William Penn , the son of the state's namesake . Prior to that, between 1638 and 1655, a southeast portion of the state was part of New Sweden , a Swedish Empire colony. Established as a haven for religious and political tolerance, the colonial-era Province of Pennsylvania
3312-774: The Chinese examples, were very inefficient compared to those used today. The iron from the Lapphyttan complex was used to produce balls of wrought iron known as osmonds , and these were traded internationally – a possible reference occurs in a treaty with Novgorod from 1203 and several certain references in accounts of English customs from the 1250s and 1320s. Other furnaces of the 13th to 15th centuries have been identified in Westphalia . The technology required for blast furnaces may have either been transferred from China, or may have been an indigenous innovation. Al-Qazvini in
3450-746: The Commonwealth of Pennsylvania ( Pennsylvania Dutch : Pennsilfaani ), is a U.S. state spanning the Mid-Atlantic , Northeastern , Appalachian , and Great Lakes regions of the United States . It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio and the Ohio River to its west, Lake Erie and New York to its north, the Delaware River and New Jersey to its east, and
3588-536: The Declaration of Independence the following year. On December 12, 1787, Pennsylvania was the second state to ratify the U.S. Constitution . In July 1863, the Battle of Gettysburg , fought over three days in and around Gettysburg , was the bloodiest and most decisive battle of the American Civil War , claiming over 50,000 Union and Confederate fatalities and repelling Robert E. Lee 's invasion of
3726-791: The Delaware River in the east and the Susquehanna River in central Pennsylvania. The second tribe, the Susquehannock , spoke an Iroquoian language and were based in Western Pennsylvania from New York state in the north to West Virginia in the southwest, including the Susquehanna, Allegheny , and Monongahela rivers near present-day Pittsburgh . European disease and constant warfare with several neighboring tribes and groups of Europeans weakened these two tribes, and they were grossly outpaced financially as
3864-482: The Delaware River to the east, 80°31' W to the west, and the 42° N to the north, except for a short segment on the western end where a triangle extends north to Lake Erie . The state has five geographical regions: Allegheny Plateau , Ridge and Valley , Atlantic Coastal Plain , Piedmont , and Erie Plain . Pennsylvania's diverse topography produces a variety of climates, though the entire state experiences cold winters and humid summers. Straddling two major zones,
4002-515: The Dominican Republic , China , Mexico , and Vietnam . Blast furnace A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron , but also others such as lead or copper . Blast refers to the combustion air being supplied above atmospheric pressure . In a blast furnace, fuel ( coke ), ores , and flux ( limestone ) are continuously supplied through
4140-884: The Hurons and Iroquois blocked them from proceeding west into Ohio during the Beaver Wars . As they lost numbers and land, the Hurons abandoned much of their western territory and moved closer to the Susquehanna River, and the Iroquois and Mohawk tribes moved further north. Northwest of the Allegheny River was the Iroquoian Petun , who were fragmented into three groups during the Beaver Wars:
4278-540: The Industrial Revolution . Hot blast was patented by James Beaumont Neilson at Wilsontown Ironworks in Scotland in 1828. Within a few years of the introduction, hot blast was developed to the point where fuel consumption was cut by one-third using coke or two-thirds using coal, while furnace capacity was also significantly increased. Within a few decades, the practice was to have a "stove" as large as
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4416-545: The Ironbridge Gorge Museums. Cast iron from the furnace was used to make girders for the world's first cast iron bridge in 1779. The Iron Bridge crosses the River Severn at Coalbrookdale and remains in use for pedestrians. The steam engine was applied to power blast air, overcoming a shortage of water power in areas where coal and iron ore were located. This was first done at Coalbrookdale where
4554-492: The Lehigh Crane Iron Company at Catasauqua, Pennsylvania , in 1839. Anthracite use declined when very high capacity blast furnaces requiring coke were built in the 1870s. The blast furnace remains an important part of modern iron production. Modern furnaces are highly efficient, including Cowper stoves to pre-heat the blast air and employ recovery systems to extract the heat from the hot gases exiting
4692-647: The Lehigh Valley region of eastern Pennsylvania . A number of White's works, including several separated sections of the Lehigh Canal are individually listed on the National Register of Historic Places (NRHP). NRHP-listed works of Josiah White include: Pennsylvania Pennsylvania ( / ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / PEN -sil- VAY -nee-ə , lit. ' Penn's forest country ' ), officially
4830-696: The Lehigh and Susquehanna Railroad . A boarding school was established by the Society of Friends in the state of Indiana through a bequest at White's death in 1850. It opened in 1861 as a mixed-race boarding school, intending to "take boys and girls without distinction of color" and educate them on spiritual and vocational matters. Two decades after opening the Institute, the Society of Friends "decided to undertake some special Indian Educational work on contract for
4968-896: The Northeast megalopolis and is associated with the Northeastern United States . Pittsburgh is part of the Great Lakes megalopolis and is often associated with the Rust Belt . During the September 11, 2001, terrorist attacks on the United States , the small town of Shanksville, Pennsylvania , received worldwide attention after United Airlines Flight 93 crashed into a field in Stonycreek Township , located 1.75 miles (2.82 km) north of
5106-556: The Schuylkill Valley , the Lehigh Valley , the Delaware Valley , and Wyoming Valley regions. Having commissioned anthracite shipment by mule train from up the Schuylkill, in 1815 White and Hazard started the Lehigh Canal machinations as commissioners, but were not selected by investors to become the operations managers elected to work out ways and means. The managers selected a slow plodding approach with which
5244-517: The Secretary of War under President Abraham Lincoln . Control of the machine was subsequently passed on to Cameron's son J. Donald Cameron , whose ineffectiveness resulted in a transfer of power to the more shrewd Matthew Quay and finally to Boies Penrose . The post-Civil War era, known as the Gilded Age , saw the continued rise of industry in Pennsylvania. Pennsylvania was home to some of
5382-791: The Spanish–American War . Pennsylvania was an important industrial center in World War I , and the state provided over 300,000 soldiers for the military. On May 31, 1918, the Pittsburgh Agreement was signed in Pittsburgh to declare the formation of the independent state of Czechoslovakia with future Czechoslovak president Tomáš Masaryk . In 1922, 310,000 Pennsylvania miners joined the UMW General coal strike , which lasted 163 days and shut down most coal mines within
5520-672: The United States . Pennsylvania has 51 miles (82 km) of coastline along Lake Erie and 57 miles (92 km) of shoreline along the Delaware Estuary . Of the original Thirteen Colonies , Pennsylvania is the only state that does not border the Atlantic Ocean . The boundaries of the state are the Mason–Dixon line (39°43' N) to the south, Twelve-Mile Circle on the Pennsylvania- Delaware border,
5658-609: The University of Pennsylvania in Philadelphia . The university, one of nine colonial colleges , was the first college established in Pennsylvania and one of the first in the nation. Today, it is an Ivy League university, which is routinely ranked among the world's best universities. Dickinson College in Carlisle , founded by Benjamin Rush and named after John Dickinson, was the first college founded after Revolutionary War and
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5796-486: The War of 1812 , he directed the effort to find a way to ignite and burn effectively anthracite coal, and succeeded. Along with his partner, Erskine Hazard , White helped found numerous companies, most either mining operations or transportation enterprises opened to establish a better transportation infrastructure for transport of this coal, people, and other industrial materials needs such as ores, timber, and finished goods in
5934-624: The county commission and freedom of religion , which were subsequently replicated in many of the Thirteen Colonies . What had been Upland on the Pennsylvania side of the Pennsylvania-Delaware border was renamed Chester County when Pennsylvania instituted its colonial governments on March 4, 1681. Penn signed a peace treaty with Tamanend , leader of the Lenape, which began a long period of friendly relations between
6072-497: The fuel efficiency of the bloomery and improves yield. They can also be built bigger than natural draught bloomeries. The oldest known blast furnaces in the West were built in Durstel in Switzerland , the Märkische Sauerland in Germany , and at Lapphyttan in Sweden , where the complex was active between 1205 and 1300. At Noraskog in the Swedish parish of Järnboås, traces of even earlier blast furnaces have been found, possibly from around 1100. These early blast furnaces, like
6210-412: The iron sulfide contained in the pig iron to form calcium sulfide (called lime desulfurization ). In a further process step, the so-called basic oxygen steelmaking , the carbon is oxidized by blowing oxygen onto the liquid pig iron to form crude steel . Cast iron has been found in China dating to the 5th century BC, but the earliest extant blast furnaces in China date to the 1st century AD and in
6348-447: The seventh-largest metropolitan area in the country and one of the largest metropolitan areas in the world, and Pittsburgh is the center of the nation's 27th-largest metropolitan areas. As of 2020, the Lehigh Valley in eastern Pennsylvania is the nation's 69th-largest metropolitan area. Pennsylvania also has six additional metropolitan areas that rank among the nation's 200-most populous metropolitan areas. Philadelphia forms part of
6486-463: The 'dwarf" blast furnaces were found in Dabieshan . In construction, they are both around the same level of technological sophistication. The effectiveness of the Chinese human and horse powered blast furnaces was enhanced during this period by the engineer Du Shi (c. AD 31), who applied the power of waterwheels to piston - bellows in forging cast iron. Early water-driven reciprocators for operating blast furnaces were built according to
6624-420: The 13th century and other travellers subsequently noted an iron industry in the Alburz Mountains to the south of the Caspian Sea . This is close to the silk route , so that the use of technology derived from China is conceivable. Much later descriptions record blast furnaces about three metres high. As the Varangian Rus' people from Scandinavia traded with the Caspian (using their Volga trade route ), it
6762-411: The 1550s, and many were built in the remainder of that century and the following ones. The output of the industry probably peaked about 1620, and was followed by a slow decline until the early 18th century. This was apparently because it was more economic to import iron from Sweden and elsewhere than to make it in some more remote British locations. Charcoal that was economically available to the industry
6900-514: The 15th U.S. president and was the first president to be born in Pennsylvania. The Battle of Gettysburg , the major turning point of the American Civil War , took place near Gettysburg in July 1863. An estimated 350,000 Pennsylvanians served in the Union Army forces, including 8,600 African American military volunteers . The politics of Pennsylvania were for decades dominated by the financially conservative Republican -aligned Cameron machine , established by U.S. Senator Simon Cameron , later
7038-446: The 17th century, also using the phosphate -rich slag from their furnaces as an agricultural fertilizer . Archaeologists are still discovering the extent of Cistercian technology. At Laskill , an outstation of Rievaulx Abbey and the only medieval blast furnace so far identified in Britain , the slag produced was low in iron content. Slag from other furnaces of the time contained a substantial concentration of iron, whereas Laskill
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#17327804019377176-541: The 1820s he and Hazard experimented with blast furnace production of smelted pig iron using charges of anthracite in Mauch Chunk in present-day Jim Thorpe, Pennsylvania , and succeeded in part, perhaps as much as any in the United States, for their processes could not always reliably repeat, so were not commercially viable in the long run. This primed them to import skills and necessary equipment when news of successful use of anthracite pig iron processes arrived from Wales in 1838; subsequently he invested heavily and had, as
7314-417: The 45th President of the United States Donald Trump occurred. Pennsylvania is 170 miles (274 km) north to south and 283 miles (455 km) east to west. Of a total 46,055 square miles (119,282 km ), 44,817 square miles (116,075 km ) are land, 490 square miles (1,269 km ) are inland waters, and 749 square miles (1,940 km ) are waters in Lake Erie . It is the 33rd-largest state in
7452-428: The 48 states. The Philadelphia Naval Shipyard served as an important naval base, and Pennsylvania produced important military leaders, including George C. Marshall , Hap Arnold , Jacob Devers , and Carl Spaatz . During the war, over a million Pennsylvanians served in the armed forces, and more Medals of Honor were awarded to Pennsylvanians than to individuals from any other state. The Three Mile Island accident
7590-479: The 4th century AD. The primary advantage of the early blast furnace was in large scale production and making iron implements more readily available to peasants. Cast iron is more brittle than wrought iron or steel, which required additional fining and then cementation or co-fusion to produce, but for menial activities such as farming it sufficed. By using the blast furnace, it was possible to produce larger quantities of tools such as ploughshares more efficiently than
7728-463: The 5th century BC , employing workforces of over 200 men in iron smelters from the 3rd century onward, the earliest blast furnaces constructed were attributed to the Han dynasty in the 1st century AD. These early furnaces had clay walls and used phosphorus -containing minerals as a flux . Chinese blast furnaces ranged from around two to ten meters in height, depending on the region. The largest ones were found in modern Sichuan and Guangdong , while
7866-408: The Americas began, at least two major Native American tribes inhabited Pennsylvania. The first, the Lenape , spoke an Algonquian language and inhabited the eastern region of the state, then known as Lenapehoking . It included most of present-day New Jersey and the Lehigh Valley and Delaware Valley regions in eastern and southeastern Pennsylvania. The Lenape's territory ended somewhere between
8004-409: The Corsican, was used prior to the advent of Christianity . Examples of improved bloomeries are the Stuckofen, sometimes called wolf-furnace, which remained until the beginning of the 19th century. Instead of using natural draught, air was pumped in by a trompe , resulting in better quality iron and an increased capacity. This pumping of air in with bellows is known as cold blast , and it increases
8142-543: The Dutch began settling the Delmarva Peninsula by establishing the Zwaanendael Colony on the site of present-day Lewes, Delaware . In 1638, Sweden established the New Sweden Colony in the region of Fort Christina on the site of present-day Wilmington, Delaware . New Sweden claimed and, for the most part, controlled the lower Delaware River region, including parts of present-day Delaware, New Jersey, and Pennsylvania, but settled few colonists there. On March 12, 1664, King Charles II of England gave James, Duke of York
8280-427: The General Assembly refused to occupy the building. In 1901, political and popular indignation prompted a second contest that was restricted to Pennsylvania architects; Joseph Miller Huston of Philadelphia was chosen to design the present Pennsylvania State Capitol that incorporated Cobb's building into a magnificent public work, finished and dedicated in 1907. James Buchanan , a Franklin County native, served as
8418-433: The Government" in 1882. By 1886, White's Institute had become a fully-fledged American Indian Boarding School , with a representative of the Society of Friends referring to it as such. Among the graduates of this school was Zitkala-Ša in 1887. White also was a founder of Beaver Meadow Railroad and Coal Company , which began producing coal in 1813. The company was the first to employ steam locomotives, which used throughout
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#17327804019378556-437: The Lehigh Canal to Philadelphia in December 1820, four years ahead of promises. Their Lehigh Coal and Navigation Companies are credited with being the earliest known example of vertical integration , the companies each sourcing at least part of the needs of the next domino in the chain. His innovations reached into finished goods as well, having learned how to burn anthracite for industrial iron processing, he experimented with
8694-439: The Lehigh Navigation and Coal Company, "gave these gentlemen the opportunity of ruining themselves, since many members of the Legislature predicted would be the result of their undertaking." The various powers applied for and granted in the act embraced the whole scope of tried and untried methods of effecting the object of getting "a navigation downward once in three days for boats loaded with one hundred barrels, or ten tons," with
8832-409: The Netherlands confirmed the English conquest on July 21, 1667, although there were temporary reversions. On September 12, 1672, during the Third Anglo-Dutch War , the Dutch reconquered New York Colony / New Amsterdam , establishing three County Courts, which went on to become original Counties in present-day Delaware and Pennsylvania. The one that later transferred to Pennsylvania was Upland. This
8970-440: The North, leading to the Union's preservation . Throughout the late 19th and 20th centuries, the state's manufacturing-based economy contributed to the development of much of the nation's early infrastructure, including key bridges, skyscrapers , and military hardware used in U.S.-led victories in World War I , World War II , and the Cold War . Pennsylvania's geography is highly diverse. The Appalachian Mountains run through
9108-439: The Petun of New York, the Wyandot of Ohio, and the Tiontatecaga of the Kanawha River in southern West Virginia. South of the Allegheny River was a nation known as Calicua, which may have been part of the Monongahela culture . In the 17th century, the Dutch and the English each claimed both sides of the Delaware River as part of their colonial lands in America. The Dutch were the first to take possession. By June 3, 1631,
9246-563: The Quakers and the Indians. Additional treaties between Quakers and other tribes followed. The Treaty of Shackamaxon of William Penn was never violated. Between 1730 and when the Pennsylvania Colony was shut down by Parliament with the Currency Act in 1764, the Pennsylvania Colony made its own paper money to account for the shortage of actual gold and silver. The paper money was called Colonial Scrip . The Colony issued bills of credit, which were as good as gold or silver coins because of their legal tender status. Since they were issued by
9384-412: The West from the High Middle Ages . They spread from the region around Namur in Wallonia (Belgium) in the late 15th century, being introduced to England in 1491. The fuel used in these was invariably charcoal. The successful substitution of coke for charcoal is widely attributed to English inventor Abraham Darby in 1709. The efficiency of the process was further enhanced by the practice of preheating
9522-538: The area with higher temperatures, ranging up to 1200 °C degrees, it is reduced further to iron metal: The carbon dioxide formed in this process is re-reduced to carbon monoxide by the coke : The temperature-dependent equilibrium controlling the gas atmosphere in the furnace is called the Boudouard reaction : The pig iron produced by the blast furnace has a relatively high carbon content of around 4–5% and usually contains too much sulphur, making it very brittle, and of limited immediate commercial use. Some pig iron
9660-432: The blast furnace, such as the Swedish electric blast furnace, have been developed in countries which have no native coal resources. According to Global Energy Monitor , the blast furnace is likely to become obsolete to meet climate change objectives of reducing carbon dioxide emission, but BHP disagrees. An alternative process involving direct reduced iron (DRI) is likely to succeed it, but this also needs to use
9798-429: The bloomery. In areas where quality was important, such as warfare, wrought iron and steel were preferred. Nearly all Han period weapons are made of wrought iron or steel, with the exception of axe-heads, of which many are made of cast iron. Blast furnaces were also later used to produce gunpowder weapons such as cast iron bomb shells and cast iron cannons during the Song dynasty . The simplest forge , known as
9936-482: The brief history of the country, where forests had grown remote from population centers through over logging, charcoal and imported coal were increasing in price rapidly, and fire wood was growing dearly expensive. White was a mill owner, and early pioneer in the advancement of civil engineering, mining, iron production, water transport . and railroad development , boat and barge shipping & construction. An innovative open-minded pragmatist, most of all in response to
10074-480: The center of the state; the Allegheny and Pocono mountains span much of Northeastern Pennsylvania ; close to 60% of the state is forested . While it has no ocean shoreline, it has 140 miles (225 km) of waterfront along Lake Erie and the tidal Delaware River. Pennsylvania is the fifth-most populous state in the United States , with over 13 million residents as of the 2020 United States census . The state
10212-429: The city's population as of 2000. In the 20th century, as Pennsylvania's historical national and even global leadership in mining largely ceased and its steelmaking and other heavy manufacturing sectors slowed, the state sought to grow its service and other industries to replace the jobs and economic productivity lost from the downturn of these industries. Pittsburgh's concentration of universities has enabled it to be
10350-489: The combustion air ( hot blast ), patented by Scottish inventor James Beaumont Neilson in 1828. Archaeological evidence shows that bloomeries appeared in China around 800 BC. Originally it was thought that the Chinese started casting iron right from the beginning, but this theory has since been debunked by the discovery of 'more than ten' iron digging implements found in the tomb of Duke Jing of Qin (d. 537 BC), whose tomb
10488-424: The combustion zone (1,773–1,873 K (1,500–1,600 °C; 2,732–2,912 °F)). Blast furnaces are currently rarely used in copper smelting, but modern lead smelting blast furnaces are much shorter than iron blast furnaces and are rectangular in shape. Modern lead blast furnaces are constructed using water-cooled steel or copper jackets for the walls, and have no refractory linings in the side walls. The base of
10626-406: The companies rights could be leased and set out to examine Lehigh's course, and tour the mine site along Pisgah Ridge to examine why both mining and delivery of coal was supposedly so difficult. They concluded the surface outcrops at the mine located in what today is Summit Hill, Pennsylvania would be easy to mine with the proper digging tools capable of breaking the hard mineral. Examination of
10764-614: The development of labor unions helped them gain living wages. However, the rise of unions also led to a rise of union busting with several private police forces springing up. Pennsylvania was the location of the first documented organized strike in North America, and Pennsylvania was the location of two hugely prominent strikes, the Great Railroad Strike of 1877 and the Coal Strike of 1902 . The eight-hour day
10902-484: The earliest known signs of human activity in Pennsylvania and perhaps all of North America, including the remains of a civilization that existed over 10,000 years ago and possibly pre-dated the Clovis culture . By 1000 CE, in contrast to their nomadic hunter-gatherer ancestors , the native population of Pennsylvania had developed agricultural techniques and a mixed food economy. By the time European colonization of
11040-578: The energy crises in the early 19th century, his focus from 1815 on was mostly about the mining, and delivery of anthracite coal to others for their manufacturing and domestic heating needs in everyday life. Having taken over an 1808 speculative charter to build locks and mill races along the Schuylkill River 's falls, which today is the shoreline along the East Falls region of Philadelphia. Historican Charles V. Hagner wrote that, "Erskine Hazard
11178-417: The fifth and currently the sixth-largest city after decades of being among the top three. After 1990, as information-based industries became more important in the economy, state and local governments put more resources into the old, well-established public library system. Some localities, however, used new state funding to cut local taxes. New ethnic groups, especially Hispanics and Latinos , began entering
11316-410: The first being that preheated air blown into the furnace reacts with the carbon in the form of coke to produce carbon monoxide and heat: Hot carbon monoxide is the reducing agent for the iron ore and reacts with the iron oxide to produce molten iron and carbon dioxide . Depending on the temperature in the different parts of the furnace (warmest at the bottom) the iron is reduced in several steps. At
11454-577: The first. At the time, Pennsylvania was the most ethnically and religiously diverse of the thirteen colonies. Because a third of Pennsylvania's population spoke German , the Constitution was presented in German so those citizens could participate in the discussion about it. Reverend Frederick Muhlenberg , a Lutheran minister and the first Speaker of the U.S. House of Representatives , acted as chairman of Pennsylvania's ratifying convention. For half
11592-704: The foundation of the colonial Province of Pennsylvania in 1681. Archaeologists believe the first settlement of the Americas occurred at least 15,000 years ago, during the Last Glacial Period , though it is unclear when humans first inhabited present-day Pennsylvania. Between 10,000 and 16,000 years ago, Native Americans crossed the two continents, arriving in North America . Meadowcroft Rockshelter in Jefferson Township includes
11730-478: The furnace has a chair shape with the lower part of the shaft being narrower than the upper. The lower row of tuyeres being located in the narrow part of the shaft. This allows the upper part of the shaft to be wider than the standard. The blast furnaces used in the Imperial Smelting Process ("ISP") were developed from the standard lead blast furnace, but are fully sealed. This is because
11868-472: The furnace is a hearth of refractory material (bricks or castable refractory). Lead blast furnaces are often open-topped rather than having the charging bell used in iron blast furnaces. The blast furnace used at the Nyrstar Port Pirie lead smelter differs from most other lead blast furnaces in that it has a double row of tuyeres rather than the single row normally used. The lower shaft of
12006-419: The furnace next to it into which the waste gas (containing CO) from the furnace was directed and burnt. The resultant heat was used to preheat the air blown into the furnace. Hot blast enabled the use of raw anthracite coal, which was difficult to light, in the blast furnace. Anthracite was first tried successfully by George Crane at Ynyscedwyn Ironworks in south Wales in 1837. It was taken up in America by
12144-481: The furnace. Competition in industry drives higher production rates. The largest blast furnace in the world is in South Korea, with a volume around 6,000 m (210,000 cu ft). It can produce around 5,650,000 tonnes (5,560,000 LT) of iron per year. This is a great increase from the typical 18th-century furnaces, which averaged about 360 tonnes (350 long tons; 400 short tons) per year. Variations of
12282-571: The government and not a banking institution, they were interest-free, largely defraying the expense of the government and therefore taxation of the people. It also promoted general employment and prosperity, since the government used discretion and did not issue excessive amounts that inflated the currency. Benjamin Franklin had a hand in creating this currency, whose utility, he said, was never to be disputed. The currency also met with "cautious approval" by Adam Smith . In 1740, Franklin also founded
12420-694: The increased demand for iron for casting cannons, the blast furnace came into widespread use in France in the mid 15th century. The direct ancestor of those used in France and England was in the Namur region, in what is now Wallonia (Belgium). From there, they spread first to the Pays de Bray on the eastern boundary of Normandy and from there to the Weald of Sussex , where the first furnace (called Queenstock) in Buxted
12558-400: The iron's quality. Coke's impurities were more of a problem before hot blast reduced the amount of coke required and before furnace temperatures were hot enough to make slag from limestone free flowing. (Limestone ties up sulphur. Manganese may also be added to tie up sulphur.) Coke iron was initially only used for foundry work, making pots and other cast iron goods. Foundry work was
12696-484: The land be called New Wales, but there were objections to that name, so he recommended Sylvania (from the Latin silva : "forest, woods"). The King named it Pennsylvania (literally "Penn's Woods") in honor of Admiral Penn. The younger Penn was embarrassed at this name, fearing that people would think he had named it after himself, but King Charles would not rename the grant. Penn established a government with two innovations,
12834-567: The largest chocolate manufacturer in North America. Heinz Company was also founded during this period. These huge companies exercised a large influence on the politics of Pennsylvania; as Henry Demarest Lloyd put it, oil baron John D. Rockefeller "had done everything with the Pennsylvania legislature except refine it". Pennsylvania created a Department of Highways and engaged in a vast program of road-building, while railroads continued to see heavy usage. The growth of industry eventually provided middle class incomes to working-class households after
12972-529: The largest steel companies in the world. Andrew Carnegie founded the Carnegie Steel Company in Pittsburgh and Charles M. Schwab founded Bethlehem Steel in Bethlehem . Other titans of industry, including John D. Rockefeller and Jay Gould , also operated in Pennsylvania. In the latter half of the 19th century, the U.S. oil industry was born in Western Pennsylvania , which supplied
13110-517: The last two punts the Lehigh Coal Mine Company (LCMC) had managed to pole down river to Philadelphia , having lost more boats than reached the safety of the docks, the bitter fruits of over a years work by the working party sent out the year before to build boats and mine coal to fill them. They soon learned the LCMC was not intending to send out other expeditions, being of a mind they'd lost sufficient money, so White and Hazard felt
13248-454: The leather bellows, which wore out quickly. Isaac was granted a second patent, also for blowing cylinders, in 1757. The steam engine and cast iron blowing cylinder led to a large increase in British iron production in the late 18th century. Hot blast was the single most important advance in fuel efficiency of the blast furnace and was one of the most important technologies developed during
13386-417: The majority of the state, except for the southeastern corner, has a humid continental climate ( Köppen climate classification Dfb ). The southern portion of the state has a humid subtropical climate. The largest city, Philadelphia , has a humid subtropical climate (Köppen Cfa ). Summers are generally hot and humid. Moving toward the mountainous interior of the state, the winter climate becomes colder,
13524-535: The molten iron was tapped twice a day into water, thereby granulating it. The General Chapter of the Cistercian monks spread some technological advances across Europe. This may have included the blast furnace, as the Cistercians are known to have been skilled metallurgists . According to Jean Gimpel, their high level of industrial technology facilitated the diffusion of new techniques: "Every monastery had
13662-502: The mountainous terrain back towards the Lehigh, they conceived a wagon road which descended steadily to a point above the river, so loading of boats could be done by chute. Lastly, they concluded the necessary river depth could be achieved for a safe down descent by employing a quasi-lock gate that sprang to mind as he examined the situations. In the event, they returned home filled with enthusiasm convinced that good management could achieve
13800-442: The north-central region with York , Carlisle , and the state capital Harrisburg on the Susquehanna River in the east-central region of the state. Altoona and Johnstown are in the state's west-central region. The state's three-most populated cities, in order of size, are Philadelphia, Pittsburgh, and Allentown. As of the 2020 U.S. census , Pennsylvania had a population of 13,011,844, up from 12,702,379 in 2010. Pennsylvania
13938-627: The number of cloudy days increases, and snowfall amounts are greater. Western areas of the state, particularly locations near Lake Erie , can receive over 100 inches (250 cm) of snowfall annually, and the entire state receives plentiful precipitation throughout the year. The state may be subject to severe weather from spring through summer into autumn. Tornadoes occur annually in the state, sometimes in large numbers, such as 30 recorded tornadoes in 2011; generally speaking, these tornadoes do not cause significant damage. Cities in Pennsylvania include Philadelphia , Reading , Lebanon , and Lancaster in
14076-654: The old Dauphin County Court House until December 1821 when the Federal -style Hills Capitol, named for Lancaster architect Stephen Hills , was constructed on a hilltop land grant of four acres set aside for a seat of state government in Harrisburg by the son and namesake of John Harris, Sr. , a Yorkshire native who founded a trading post and ferry on the east shore of the Susquehanna River in 1705. The Hills Capitol burned down on February 2, 1897, during
14214-673: The operating manager, had the Lehigh Coal & Navigation Company invest in the Lehigh Crane Iron Company backing the importing of professional talent from Wales to establish the first sustainably-successful blast furnaces of the region in Catasauqua , and established the first wire rope factory in the United States in Mauch Chunk, which enabled Ashley Planes and up cable railway conversion and expansion of Mauch Chunk Switchback Railway . In 1814, White and Hazard obtained
14352-399: The particle size of the coke or charcoal is of great relevance. Therefore, the coke must be strong enough so it will not be crushed by the weight of the material above it. Besides the physical strength of its particles, the coke must also be low in sulfur, phosphorus , and ash. The main chemical reaction producing the molten iron is: This reaction might be divided into multiple steps, with
14490-488: The partners quarreled, championing instead a means to deliver coal down river much more quickly using temporary dams and artificial freshets in order to produce revenue from one way traffic delivering coal. This method was rejected by the managers, resulting in the belated first deliveries of coal on the Schuylkill Canal only in 1823, while their method delivered record amount of 365 long-tons of anthracite coal down
14628-457: The pig iron. It reacts with calcium oxide (burned limestone) and forms silicates, which float to the surface of the molten pig iron as slag. Historically, to prevent contamination from sulfur, the best quality iron was produced with charcoal. In a blast furnace, a downward-moving column of ore, flux, coke (or charcoal ) and their reaction products must be sufficiently porous for the flue gas to pass through, upwards. To ensure this permeability
14766-404: The principle of chemical reduction whereby carbon monoxide converts iron oxides to elemental iron. Blast furnaces differ from bloomeries and reverberatory furnaces in that in a blast furnace, flue gas is in direct contact with the ore and iron, allowing carbon monoxide to diffuse into the ore and reduce the iron oxide. The blast furnace operates as a countercurrent exchange process whereas
14904-419: The reaction zone. As the material travels downward, the counter-current gases both preheat the feed charge and decompose the limestone to calcium oxide and carbon dioxide: The calcium oxide formed by decomposition reacts with various acidic impurities in the iron (notably silica ), to form a fayalitic slag which is essentially calcium silicate , Ca Si O 3 : As the iron(II) oxide moves down to
15042-429: The remainder from Africa (5%), North America (3.1%), and Oceania (0.4%). The state's largest ancestry groups, expressed as a percentage of total people who responded with a particular ancestry for the 2010 census, were German 28.5%, Irish 18.2%, Italian 12.8%, African Americans 9.6%, English 8.5%, Polish 7.2%, and French 4.2%. As of 2018, the top countries of origin for Pennsylvania's immigrants were India ,
15180-659: The reservation on the part of the Legislature of the right to compel the adoption of a complete slack-water navigation from Easton to Stoddartsville. Knowing the bill was coming up in the spring of 1818, the partners had contractors and hires prepped and ready... Erskine Hazard-founding partners of the Lehigh Coal Company, the Lehigh Navigation Company, Ashley Planes , the Lehigh Canal , Lehigh and Susquehanna Railroad , Lehigh Coal & Navigation Company , Mauch Chunk Switchback Railway , and
15318-529: The river. They stated in the petition their object of getting coal to market, and that they had a plan for the cheap improvement of the river navigation, which they hoped would serve as a model for the improvement of many other streams in the State. Their project was considered chimerical, the improvement of the Lehigh being deemed impracticable from the failure of the various companies who had undertaken it under previous laws. The act of March 20, 1818, incorporating
15456-404: The southeast, Pittsburgh in the southwest, and the tri-cities of Allentown , Bethlehem , and Easton in the central east, known as the Lehigh Valley . The northeast includes the former anthracite coal mining cities of Scranton , Wilkes-Barre , Pittston , Nanticoke , and Hazleton . Erie is located in the northwest. State College is located in the central region. Williamsport is in
15594-581: The state to fill low-skill jobs in agriculture and service industries. For example, in Chester County , Mexican immigrants brought the Spanish language , increased Catholicism , high birth rates, and cuisine when they were hired as agricultural laborers; in some rural localities, they made up half or more of the population. Stateside Puerto Ricans built a large community in the state's third-largest city, Allentown , where they comprise over 40% of
15732-827: The state. In 1923, President Calvin Coolidge established the Allegheny National Forest under the authority of the Weeks Act of 1911. The forest is located in the northwest part of the state in Elk , Forest , McKean , and Warren Counties for the purposes of timber production and watershed protection in the Allegheny River basin. The Allegheny is the state's only national forest. Pennsylvania manufactured 6.6 percent of total U.S. military armaments produced during World War II , ranking sixth among
15870-534: The state." The ensuing hostilities became known as Pontiac's War . After the Stamp Act Congress of 1765, delegate John Dickinson of Philadelphia wrote the Declaration of Rights and Grievances . The Congress was the first meeting of the Thirteen Colonies , which convened at the request of the Massachusetts assembly; nine of the 13 colonies sent delegates. Dickinson then wrote Letters from
16008-479: The structure of horse powered reciprocators that already existed. That is, the circular motion of the wheel, be it horse driven or water driven, was transferred by the combination of a belt drive , a crank-and-connecting-rod, other connecting rods , and various shafts, into the reciprocal motion necessary to operate a push bellow. Donald Wagner suggests that early blast furnace and cast iron production evolved from furnaces used to melt bronze . Certainly, though, iron
16146-458: The term has usually been limited to those used for smelting iron ore to produce pig iron , an intermediate material used in the production of commercial iron and steel , and the shaft furnaces used in combination with sinter plants in base metals smelting. Blast furnaces are estimated to have been responsible for over 4% of global greenhouse gas emissions between 1900 and 2015, but are difficult to decarbonize. Blast furnaces operate on
16284-403: The top of the furnace, while a hot blast of air (sometimes with oxygen enrichment) is blown into the lower section of the furnace through a series of pipes called tuyeres , so that the chemical reactions take place throughout the furnace as the material falls downward. The end products are usually molten metal and slag phases tapped from the bottom, and waste gases ( flue gas ) exiting from
16422-524: The top of the furnace. The downward flow of the ore along with the flux in contact with an upflow of hot, carbon monoxide -rich combustion gases is a countercurrent exchange and chemical reaction process. In contrast, air furnaces (such as reverberatory furnaces ) are naturally aspirated, usually by the convection of hot gases in a chimney flue . According to this broad definition, bloomeries for iron, blowing houses for tin , and smelt mills for lead would be classified as blast furnaces. However,
16560-427: The top, where the temperature usually is in the range between 200 °C and 700 °C, the iron oxide is partially reduced to iron(II,III) oxide, Fe 3 O 4 . The temperatures 850 °C, further down in the furnace, the iron(II,III) is reduced further to iron(II) oxide: Hot carbon dioxide, unreacted carbon monoxide, and nitrogen from the air pass up through the furnace as fresh feed material travels down into
16698-549: The town. All 40 civilians and 4 Al-Qaeda hijackers on board were killed. The hijackers had intended to crash the plane into either the United States Capitol or The White House . After learning from family members via air phone of the earlier attacks on the World Trade Center , however, Flight 93's passengers revolted against the hijackers and fought for control of the plane, causing it to crash. It
16836-533: The unification of the states. Established in 1773, it was ratified on September 9, 1783, five days after the Treaty of Paris . James Smith wrote that in 1763, "the Indians again commenced hostilities, and were busily engaged in killing and scalping the frontier inhabitants in various parts of Pennsylvania. This state was then a Quaker government, and at the first of this war the frontiers received no assistance from
16974-576: The vast majority of kerosene for years thereafter. As the Pennsylvania oil rush developed, Pennsylvania's oil boom towns, such as Titusville , rose and later fell. Coal mining, primarily in the state's Coal Region in the northeast region of the state, also was a major industry for much of the 19th and 20th centuries. In 1903, Milton S. Hershey began construction on a chocolate factory in Hershey, Pennsylvania ; The Hershey Company grew to become
17112-774: The world charcoal was cheaper while coke was more expensive even after the Industrial Revolution: e. g., in the US charcoal-fueled iron production fell in share to about a half ca. 1850 but still continued to increase in absolute terms until ca. 1890, while in João Monlevade in the Brazilian Highlands charcoal-fired blast furnaces were built as late as the 1930s and only phased out in 2000. Darby's original blast furnace has been archaeologically excavated and can be seen in situ at Coalbrookdale, part of
17250-586: The zinc produced by these furnaces is recovered as metal from the vapor phase, and the presence of oxygen in the off-gas would result in the formation of zinc oxide. Blast furnaces used in the ISP have a more intense operation than standard lead blast furnaces, with higher air blast rates per m of hearth area and a higher coke consumption. Zinc production with the ISP is more expensive than with electrolytic zinc plants, so several smelters operating this technology have closed in recent years. However, ISP furnaces have
17388-532: Was built in about 1491, followed by one at Newbridge in Ashdown Forest in 1496. They remained few in number until about 1530 but many were built in the following decades in the Weald, where the iron industry perhaps reached its peak about 1590. Most of the pig iron from these furnaces was taken to finery forges for the production of bar iron . The first British furnaces outside the Weald appeared during
17526-527: Was essential to military success by the time the State of Qin had unified China (221 BC). Usage of the blast and cupola furnace remained widespread during the Song and Tang dynasties . By the 11th century, the Song dynasty Chinese iron industry made a switch of resources from charcoal to coke in casting iron and steel, sparing thousands of acres of woodland from felling. This may have happened as early as
17664-550: Was eventually adopted, and the coal and iron police were banned. At the beginning of the 20th century, Pennsylvania's economy centered on steel production, logging , coal mining , textile production, and other forms of industrial manufacturing . A surge in immigration to the U.S. during the late 19th and early 20th centuries provided a steady flow of cheap labor for these industries, which often employed children and people who could not speak English from Southern and Eastern Europe . Thousands of Pennsylvanians volunteered during
17802-529: Was its lower cost, mainly because making coke required much less labor than cutting trees and making charcoal, but using coke also overcame localized shortages of wood, especially in Britain and eleswhere in Europe. Metallurgical grade coke will bear heavier weight than charcoal, allowing larger furnaces. A disadvantage is that coke contains more impurities than charcoal, with sulfur being especially detrimental to
17940-727: Was known for its relatively peaceful relations with native tribes, innovative government system , and religious pluralism . Pennsylvania played a vital and historic role in the American Revolution and the ultimately successful quest for independence from the British Empire , hosting the First and Second Continental Congress in Philadelphia , which formed the Continental Army and appointed George Washington as its commander in 1775, and unanimously adopted
18078-710: Was not yet in British possession, but the sale boxed in the portion of New Netherland on the West side of the Delaware River. The British conquest of New Netherland began on August 29, 1664, when New Amsterdam was coerced to surrender while facing cannons on British ships in New York Harbor . The conquest was completed in October 1664, when the British captured Fort Casimir in what today is New Castle, Delaware . The Treaty of Breda between England, France, and
18216-543: Was once again chosen to be cradle to the new nation. The Constitution was drafted and signed at the Pennsylvania State House in Philadelphia, now known as Independence Hall , the same building where the Declaration of Independence was previously adopted and signed in 1776. On December 12, 1787, Pennsylvania was the second state to ratify the U.S. Constitution , five days after Delaware became
18354-556: Was partially reversed on February 9, 1674, when the Treaty of Westminster ended the Third Anglo-Dutch War and reverted all political situations to the status quo ante bellum . The British retained the Dutch Counties with their Dutch names. By June 11, 1674, New York reasserted control over the outlying colonies, including Upland, and the names started to be changed to British names by November 11, 1674. Upland
18492-439: Was partitioned on November 12, 1674, producing the general outline of the current border between Pennsylvania and Delaware. On February 28, 1681, Charles II granted a land charter to Quaker leader William Penn to repay a debt of £16,000 (around £2,100,000 in 2008, adjusting for retail inflation) owed to William's father. The transaction represents one of the largest land grants to an individual in history. Penn proposed that
18630-646: Was probably being consumed as fast as the wood to make it grew. The first blast furnace in Russia opened in 1637 near Tula and was called the Gorodishche Works. The blast furnace spread from there to central Russia and then finally to the Urals . In 1709, at Coalbrookdale in Shropshire, England, Abraham Darby began to fuel a blast furnace with coke instead of charcoal . Coke's initial advantage
18768-441: Was the most significant nuclear accident in U.S. commercial nuclear power plant history. The state was hard-hit by the decline and restructuring of the steel industry and other heavy industries during the late 20th century. With job losses came heavy population losses, especially in the state's largest cities. Pittsburgh lost its place among the top ten most populous cities in the United States by 1950, and Philadelphia dropped to
18906-657: Was the only one of the four aircraft hijacked that day that never reached its intended target and the heroism of the passengers has been commemorated. Since 2003, the Tekko anime convention has been held annually in Pittsburgh. In October 2018, the Tree of Life – Or L'Simcha Congregation , a conservative Jewish synagogue, experienced the Pittsburgh synagogue shooting , which resulted in 11 fatalities. On July 13, 2024, near Butler, Pennsylvania , an assassination attempt on
19044-415: Was the partner of Josiah, White in the iron and wire business; in the, erection of the locks and mill-seats he had, another partner, Joseph Gillingham. They finished the locks and canal on the western side of, the river and two mills were built there — one a sawmill, the other for making white lead." These were in addition to the two main mills of White and Hazard, which were on the east or left bank. During
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