123-561: The Gerontology Research Group ( GRG ) based in Los Angeles , California, US, is a global non-profit scientific organization of researchers in various fields of gerontology , primarily concerned with validating the ages of, recording and researching supercentenarians (people who are at least 110 years old). The group endeavors to further gerontology research with a goal of slowing and reversing aging. Many of its worldwide correspondents are respected scientists and PhD holders. The GRG
246-548: A Mexican element advocating annexation of the entire country to the United States. The majority of congress supported the government's peace policy viewing in the Treaty of Guadalupe nothing but the unfortunate result of a poorly fought war, and viewed under this perspective as a national necessity. A foreign relations commission returned affirmative answers to two questions that congress had directed it to report upon: May
369-432: A conquered enemy. Trist negotiated with a special commission representing the collapsed government led by José Bernardo Couto, Miguel de Atristain, and Luis Gonzaga Cuevas of Mexico. Although Mexico ceded Alta California and Santa Fe de Nuevo México , the text of the treaty did not list territories to be ceded and avoided the disputed issues that were causes of war: the validity of the 1836 revolution that established
492-473: A far better negotiating position than the military situation might have suggested. A further consideration was the growing opposition to slavery that had caused Mexico to end formal slavery in 1829 and its awareness of the well-known and growing sectional divide in the U.S. over the issue of slavery. It, therefore, made sense for Mexico to negotiate to play Northern U.S. interests against Southern U.S. interests. The Mexicans proposed peace terms that offered only
615-558: A large part of Chihuahua was supported by both senators from Texas ( Sam Houston and Thomas Jefferson Rusk ), Daniel S. Dickinson of New York, Stephen A. Douglas of Illinois, Edward A. Hannegan of Indiana, and one each from Alabama, Florida, Mississippi, Ohio, Missouri, and Tennessee. Most of the leaders of the Democratic party, Thomas Hart Benton , John C. Calhoun , Herschel V. Johnson , Lewis Cass , James Murray Mason of Virginia and Ambrose Hundley Sevier were opposed, and
738-565: A national guard. On 26 May 1848 the government received the commissioners Nathan Clifford and Ambrose Hundley Sevier who were in Mexico to negotiate the treaty after congress had approved it with some slight modifications. Meanwhile, the President had to deal with guerilla warfare throughout the country afflicting both the American occupiers and Mexican merchants. The aim of the guerillas
861-485: A profit; the other, according to an analysis of contemporary newspaper reports, was the 1932 Summer Olympics , also held in Los Angeles. Racial tensions erupted on April 29, 1992, with the acquittal by a Simi Valley jury of four Los Angeles Police Department (LAPD) officers captured on videotape beating Rodney King , culminating in large-scale riots . In 1994, the magnitude 6.7 Northridge earthquake shook
984-414: A rejection of peace terms so favorable to Northern interests might have the potential to provoke sectional conflict in the United States or perhaps even a civil war that would fatally undermine the U.S. military position in Mexico. Instead, these terms, combined with other Mexican demands (in particular, for various indemnities), only provoked widespread indignation throughout the United States without causing
1107-507: A single type, where industrial uses were prohibited. The proscriptions included barns, lumber yards, and any industrial land use employing machine-powered equipment. These laws were enforced against industrial properties after the fact. These prohibitions were in addition to existing activities that were already regulated as nuisances. These included explosives warehousing, gas works, oil drilling, slaughterhouses, and tanneries . Los Angeles City Council also designated seven industrial zones within
1230-438: Is Mount San Antonio , locally known as Mount Baldy, which reaches 10,064 feet (3,068 m). Further afield, the highest point in southern California is San Gorgonio Mountain , 81 miles (130 km) east of downtown Los Angeles, with a height of 11,503 feet (3,506 m). The Los Angeles River , which is largely seasonal, is the primary drainage channel . It was straightened and lined in 51 miles (82 km) of concrete by
1353-722: Is a common problem in this population. Although Serieys et al. 2014 find selection of immune genetics at several loci they do not demonstrate that this produces a real difference which helps the bobcats to survive future mange outbreaks . Los Angeles is subject to earthquakes because of its location on the Pacific Ring of Fire . The geologic instability has produced numerous faults , which cause approximately 10,000 earthquakes annually in Southern California, though most of them are too small to be felt. The strike-slip San Andreas Fault system, which sits at
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#17327985833031476-452: Is complicated by rugged terrain, which has necessitated having different grids for each of the valleys that Los Angeles covers. Major streets are designed to move large volumes of traffic through many parts of the city, many of which are extremely long; Sepulveda Boulevard is 43 miles (69 km) long, while Foothill Boulevard is over 60 miles (97 km) long, reaching as far east as San Bernardino. Drivers in Los Angeles suffer from one of
1599-437: Is divided into many different districts and neighborhoods, some of which had been separately incorporated cities that eventually merged with Los Angeles. These neighborhoods were developed piecemeal, and are well-defined enough that the city has signage which marks nearly all of them. The city's street patterns generally follow a grid plan , with uniform block lengths and occasional roads that cut across blocks. However, this
1722-502: Is expected to continue to drop in the coming years because of aggressive steps to reduce it, which include electric and hybrid cars, improvements in mass transit , and other measures. The number of Stage 1 smog alerts in Los Angeles has declined from over 100 per year in the 1970s to almost zero in the new millennium. Despite improvement, the 2006 and 2007 annual reports of the American Lung Association ranked
1845-488: Is rich in native plant species partly because of its diversity of habitats, including beaches, wetlands , and mountains. The most prevalent plant communities are coastal sage scrub , chaparral shrubland, and riparian woodland . Native plants include: the California poppy , matilija poppy , toyon , Ceanothus , Chamise , Coast Live Oak , sycamore , willow and Giant Wildrye . Many of these native species, such as
1968-422: Is the county seat of Los Angeles County , which is the most populous county in the United States with an estimated 9.86 million residents as of 2022 . It is the third-most visited city in the U.S. with over 2.7 million visitors as of 2023. The area that became Los Angeles was originally inhabited by the indigenous Tongva people and later claimed by Juan Rodríguez Cabrillo for Spain in 1542. The city
2091-413: The 1916 New York City Zoning Ordinance did. Second, the residential zones did not distinguish types of housing; they treated apartments, hotels, and detached-single-family housing equally. In 1910, Hollywood merged into Los Angeles, with 10 movie companies already operating in the city at the time. By 1921, more than 80 percent of the world's film industry was concentrated in L.A. The money generated by
2214-581: The American Civil War just over a decade later. Border disputes continued. Mexico's economic problems persisted, leading to the controversial Gadsden Purchase in 1854, intended to rectify an error in the original treaty, but led to Mexico demanding a large sum of money for the revision, which was paid. There was also William Walker 's short-lived Republic of Lower California filibustering incident in that same year. The Channel Islands of California and Farallon Islands are not mentioned in
2337-535: The American Civil War , and the United States crossed the border during the war of Second French intervention in Mexico . In March 1916, Pancho Villa led a raid on the U.S. border town of Columbus, New Mexico , which was followed by the Pershing expedition . The shifting of the Rio Grande since the signing of the Treaty of Guadalupe caused a dispute over the boundary between the states of New Mexico and Texas,
2460-868: The Army Corps of Engineers to act as a flood control channel. The river begins in the Canoga Park district of the city, flows east from the San Fernando Valley along the north edge of the Santa Monica Mountains, and turns south through the city center, flowing to its mouth in the Port of Long Beach at the Pacific Ocean. The smaller Ballona Creek flows into the Santa Monica Bay at Playa del Rey . Los Angeles
2583-529: The COVID-19 pandemic , Los Angeles is still one of the largest hubs of American film production , the world's largest by revenue; the city is an important site in the history of film . It also has one of the busiest container ports in the Americas. In 2018, the Los Angeles metropolitan area had a gross metropolitan product of over $ 1.0 trillion, making it the city with the third-largest GDP in
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#17327985833032706-575: The Disturnell map , then due west from this point to the 110th meridian west , then north along the 110th meridian to the Gila River and down the river to its mouth. Unlike the New Mexico segment of the boundary, which depended partly on unknown geography, "to preclude all difficulty in tracing upon the ground the limit separating Upper from Lower California ", a straight line was drawn from
2829-577: The Gadsden Purchase , which was carried out in 1853. In this purchase, the United States paid an additional $ 10 million (equivalent to $ 290 million in 2023) for land intended to accommodate a transcontinental railroad . However, the American Civil War delayed the construction of such a route, and it was not until 1881 that the Southern Pacific Railroad finally was completed as a second transcontinental railroad, fulfilling
2952-547: The Hillside Stranglers murder cases in 1977–1978. In early 1984, the city surpassed Chicago in population, thus becoming the second largest city in the United States. In 1984, the city hosted the Summer Olympic Games for the second time . Despite being boycotted by 14 Communist countries , the 1984 Olympics became more financially successful than any previous, and the second Olympics to turn
3075-487: The Los Angeles sunflower , have become so rare as to be considered endangered. Mexican Fan Palms , Canary Island Palms , Queen Palms , Date Palms , and California Fan Palms are common in the Los Angeles area, although only the last is native to California, though still not native to the City of Los Angeles. Los Angeles has a number of official flora: The city has an urban population of bobcats ( Lynx rufus ). Mange
3198-593: The Mission San Gabriel Arcángel , the first mission in the area. On September 4, 1781, a group of 44 settlers known as " Los Pobladores " founded the pueblo (town) they called El Pueblo de Nuestra Señora la Reina de los Ángeles , 'The Town of Our Lady the Queen of the Angels';. The present-day city has the largest Roman Catholic archdiocese in the United States. Two-thirds of
3321-584: The Oregon boundary dispute ) arose between Great Britain (as the claimant of modern Canada) and the United States. On 10 November 1845, before the outbreak of hostilities, President James K. Polk sent his envoy, John Slidell , to Mexico. Slidell had instructions to offer Mexico around $ 5 million for the territory of Nuevo México and up to $ 40 million for Alta California . The Mexican government dismissed Slidell, refusing to even meet with him. Earlier in that year, Mexico had broken off diplomatic relations with
3444-574: The Republic of Texas as an independent country, had warned that annexation would be viewed as an act of war . Both the United Kingdom and France recognized the Republic of Texas's independence and repeatedly tried to dissuade Mexico from declaring war against its northern neighbor. British efforts to mediate the quandary proved fruitless, in part because other political disputes (particularly
3567-501: The Republic of Texas , Texas's boundary claims as far as the Rio Grande, and the right of the Republic of Texas to arrange the 1845 annexation of Texas by the United States. Instead, Article V of the treaty described the new U.S.–Mexico border . From east to west, the border consisted of the Rio Grande northwest from its mouth to the point where it strikes the southern boundary of New Mexico (roughly 32 degrees north), as shown in
3690-577: The Spanish Empire in 1542, while on an official military exploring expedition, as he was moving northward along the Pacific coast from earlier colonizing bases of New Spain in Central and South America. Gaspar de Portolà and Franciscan missionary Juan Crespí reached the present site of Los Angeles on August 2, 1769. In 1771, Franciscan friar Junípero Serra directed the building of
3813-471: The U.S. state of California . With an estimated 3,820,914 residents within the city limits as of 2023 , it is the second-most populous city in the United States, behind only New York City ; it is also the commercial, financial and cultural center of Southern California . Los Angeles has an ethnically and culturally diverse population, and is the principal city of a metropolitan area of 12.8 million people (2023). Greater Los Angeles , which includes
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3936-543: The United States Senate eliminated Article X, which stated that the U.S. government would honor and guarantee all land grants awarded in lands ceded to the United States by those respective governments to citizens of Spain and Mexico. Article VIII guaranteed that Mexicans who remained more than one year in the ceded lands would automatically become full-fledged United States citizens (or they could declare their intention of remaining Mexican citizens); however,
4059-499: The pueblo (town) they called El Pueblo de Nuestra Señora la Reina de los Ángeles , 'The Town of Our Lady the Queen of the Angels'. The original name of the settlement is disputed; the Guinness Book of World Records rendered it as "El Pueblo de Nuestra Señora la Reina de los Ángeles del Río Porciúncula "; other sources have shortened or alternate versions of the longer name. The local English pronunciation of
4182-577: The siege of Los Angeles where 150 Mexican militias fought the occupiers which eventually surrendered. Mexican rule ended during following the American Conquest of California , part of the larger Mexican-American War . Americans took control from the Californios after a series of battles, culminating with the signing of the Treaty of Cahuenga on January 13, 1847. The Mexican Cession
4305-607: The 1930s, / l ɔː s ˈ æ n dʒ əl ə s / has been most common. In 1934, the United States Board on Geographic Names decreed that this pronunciation be used by the federal government. This was also endorsed in 1952 by a "jury" appointed by Mayor Fletcher Bowron to devise an official pronunciation. Common pronunciations in the United Kingdom include / l ɒ s ˈ æ n dʒ ɪ l iː z , - l ɪ z , - l ɪ s / loss AN -jil-eez, -iz, -iss . Phonetician Jack Windsor Lewis described
4428-507: The 20th century, Los Angeles substantially reduced the amount of housing that could be built by drastically downzoning the city. In 1960, the city had a total zoned capacity for approximately 10 million people. By 1990, that capacity had fallen to 4.5 million as a result of policy decisions to ban housing through zoning. Racial tensions led to the Watts riots in 1965, resulting in 34 deaths and over 1,000 injuries. In 1969, California became
4551-473: The 21st century. The United States also agreed to assume $ 3.25 million (equivalent to $ 114.5 million today) in debts that Mexico owed to United States citizens. The residents had one year to choose whether they wanted American or Mexican citizenship; over 90% chose American citizenship. The others moved to what remained of Mexico (where they received land) or, in some cases in New Mexico, were allowed to remain in place as Mexican citizens. Article XII engaged
4674-507: The City of Los Angeles from selling or providing water from the aqueduct to any area outside its borders, many adjacent cities and communities felt compelled to join Los Angeles. Los Angeles created the first municipal zoning ordinance in the United States. On September 14, 1908, the Los Angeles City Council promulgated residential and industrial land use zones. The new ordinance established three residential zones of
4797-458: The Gadsden purchase of 1854, had significant implications for the Treaty of Guadalupe Hidalgo. Article II of the treaty annulled article XI of the Treaty of Guadalupe Hidalgo, and article IV further annulled articles VI and VII of Guadalupe Hidalgo. Article V, however, reaffirmed the property guarantees of Guadalupe Hidalgo, specifically those contained within articles VIII and IX. In addition to
4920-671: The Los Angeles and Riverside–San Bernardino metropolitan areas, is a sprawling metropolis of over 18.3 million residents. The majority of the city proper lies in a basin in Southern California adjacent to the Pacific Ocean in the west and extending partly through the Santa Monica Mountains and north into the San Fernando Valley , with the city bordering the San Gabriel Valley to its east. It covers about 469 square miles (1,210 km ), and
5043-688: The Los Angeles area include the 1933 Long Beach , 1971 San Fernando , 1987 Whittier Narrows , and the 1994 Northridge events. All but a few are of low intensity and are not felt. The USGS has released the UCERF California earthquake forecast , which models earthquake occurrence in California. Parts of the city are also vulnerable to tsunamis ; harbor areas were damaged by waves from Aleutian Islands earthquake in 1946, Valdivia earthquake in 1960, Alaska earthquake in 1964, Chile earthquake in 2010 and Japan earthquake in 2011. The city
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5166-502: The Los Angeles area was the headquarters of six of the country's major aircraft manufacturers ( Douglas Aircraft Company , Hughes Aircraft , Lockheed , North American Aviation , Northrop Corporation , and Vultee ). During the war, more aircraft were produced in one year than in all the pre-war years since the Wright brothers flew the first airplane in 1903, combined. Manufacturing in Los Angeles skyrocketed, and as William S. Knudsen , of
5289-685: The Los Angeles/Long Beach port complex, Los Angeles suffers from air pollution in the form of smog. The Los Angeles Basin and the San Fernando Valley are susceptible to atmospheric inversion , which holds in the exhausts from road vehicles, airplanes, locomotives, shipping, manufacturing, and other sources. The smog season lasts from approximately May to October. While other large cities rely on rain to clear smog, Los Angeles gets only 15 inches (380 mm) of rain each year: pollution accumulates over many consecutive days. Issues of air quality in Los Angeles and other major cities led to
5412-469: The Mexican government was reluctant to agree to the loss of California and New Mexico. Even with its capital under enemy occupation, the Mexican government was inclined to consider factors such as the unwillingness of the U.S. administration to annex Mexico outright and what appeared to be deep divisions in domestic U.S. opinion regarding the war and its aims, which caused it to imagine that it was actually in
5535-434: The Mexican or ( New Spain ) settlers were mestizo or mulatto , a mixture of African, indigenous and European ancestry. The settlement remained a small ranch town for decades, but by 1820, the population had increased to about 650 residents. Today, the pueblo is commemorated in the historic district of Los Angeles Pueblo Plaza and Olvera Street , the oldest part of Los Angeles. New Spain achieved its independence from
5658-523: The National Defense Advisory Commission put it, "We won because we smothered the enemy in an avalanche of production, the like of which he had never seen, nor dreamed possible." After the end of World War II Los Angeles grew more rapidly than ever, sprawling into the San Fernando Valley . The expansion of the state owned Interstate Highway System during the 1950s and 1960s helped propel suburban growth and signaled
5781-443: The Republic of Texas included no territory west of the Rio Grande. The Mexican Cession included essentially the entirety of the former Mexican territory of Alta California , but only the western portion of Santa Fe de Nuevo Mexico , and includes all of present-day California , Nevada and Utah , most of Arizona , western portions of New Mexico and Colorado , and the southwestern corner of Wyoming . Articles VIII and IX ensured
5904-696: The San Fernando Valley. Other hilly parts of Los Angeles include the Mt. Washington area north of Downtown, eastern parts such as Boyle Heights , the Crenshaw district around the Baldwin Hills , and the San Pedro district. Surrounding the city are much higher mountains. Immediately to the north lie the San Gabriel Mountains , which is a popular recreation area for Angelenos. Its high point
6027-620: The Senate modified Article IX, changing the first paragraph and excluding the last two. Among the changes was that Mexican citizens would "be admitted at the proper time (to be judged of by the Congress of the United States)" instead of "admitted as soon as possible", as negotiated between Trist and the Mexican delegation. An amendment by Jefferson Davis giving the United States most of Tamaulipas and Nuevo León , all of Coahuila , and
6150-527: The Southern Californian coast, is subject to a late spring/early summer weather phenomenon called " June Gloom ". This involves overcast or foggy skies in the morning that yield to sun by early afternoon. More recently, statewide droughts in California have further strained the city's water security . Downtown Los Angeles averages 14.67 in (373 mm) of precipitation annually, mainly occurring between November and March, generally in
6273-475: The Spanish Empire in 1821, and the pueblo now existed within the new Mexican Republic . During Mexican rule, Governor Pío Pico made Los Angeles the regional capital of Alta California . By this time, the new republic introduced more secularization acts within the Los Angeles region. In 1846, during the wider Mexican-American war , marines from the United States occupied the pueblo. This resulted in
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#17327985833036396-467: The State Department under President Polk, finally negotiated a treaty with the Mexican delegation after ignoring his recall by President Polk in frustration with the failure to secure a treaty. Notwithstanding that the treaty had been negotiated against his instructions, given its achievement of the major American aim, President Polk passed it on to the Senate. The Treaty of Guadalupe Hidalgo
6519-447: The Treaty. The border commission also faced many difficulties in mapping out the border, with the surveying process lasting over 7 years, due to the challenges of marking out a border in such a vast desolate territory and negotiating with indigenous Americans who had not been considered in the prior treaty negotiations. The armed forces of both countries routinely crossed the border. Mexican and Confederate troops often clashed during
6642-461: The U.S. Although each state had different motivations for adopting the Spanish approach, one common driver was that it was already in place in the region for many years. Changing to a common law system for marital property "would have been nothing short of a revolution". The United States received the territories of Alta California and Santa Fe de Nuevo México . Today they comprise some or all of
6765-447: The U.S. envoy, Nicholas Trist . The resulting treaty required Mexico to cede 55 percent of its territory including the present-day states of California , Nevada , Utah , most of Colorado , New Mexico and Arizona , and a small portion of Wyoming . Mexico also relinquished all claims for Texas and recognized the Rio Grande as the southern boundary of Texas. In turn, the U.S. government paid Mexico $ 15 million "in consideration of
6888-440: The U.S. government for damages done by Comanche and Apache raids between 1848 and 1853. In 1853, in the Treaty of Mesilla concluding the Gadsden Purchase , Article XI was annulled. The land that the Treaty of Guadalupe Hidalgo brought into the United States became, between 1850 and 1912, all or part of nine states: California (1850), Nevada (1864), Utah (1896), and Arizona (1912), as well as, depending upon interpretation,
7011-508: The U.S. government within a year of the Treaty being signed; otherwise, they could remain Mexican citizens, but they would have to relocate. Between 1850 and 1920, the U.S. Census counted most Mexicans as racially "white". Community property rights in California and other western states are based on the Visigothic Code which Spain adopted and then brought to the Americas, including the former territories of Mexico that were ceded to
7134-459: The U.S. states of Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. While this land was vast in area, most of it was very sparsely populated, inhabited mostly by indigenous Americans, rather than white Americans or Mexicans. Disputes about whether to make all this new territory into free states or slave states contributed heavily to the rise in North–South tensions that led to
7257-491: The United States to pay, "In consideration of the extension acquired", 15 million dollars (equivalent to $ 530 million today), in annual installments of 3 million dollars. Article XI of the treaty was important to Mexico. It provided that the United States would prevent and punish raids by Indians into Mexico, prohibited Americans from acquiring property, including livestock, taken by the Indians in those raids, and stated that
7380-491: The United States would return captives of the Indians to Mexico. Mexicans believed that the United States had encouraged and assisted the Comanche and Apache raids that had devastated northern Mexico in the years before the war. This article promised relief to them. Article XI, however, proved unenforceable. Destructive Indian raids continued despite a heavy U.S. presence near the Mexican border. Mexico filed 366 claims with
7503-527: The United States, based partly on its interpretation of the Adams–Onís Treaty of 1819, under which newly independent Mexico claimed it had inherited rights. In that agreement, the United States had "renounced forever" all claims to Spanish territory. Neither side took any further action to avoid a war. Meanwhile, Polk settled a major territorial dispute with Britain via the Oregon Treaty , which
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#17327985833037626-590: The United States, the 1.36 million km (530,000 sq mi) of the area between the Adams-Onis and Guadalupe Hidalgo boundaries outside the 1,007,935 km (389,166 sq mi) claimed by the Republic of Texas is known as the Mexican Cession . That is to say, the Mexican Cession is construed not to include any territory east of the Rio Grande, while the territorial claims of
7749-593: The United States, would have been presumed by Northerners to be forever free of slavery. The Mexicans also offered to recognize the freedom of Texas from Mexican rule and its right to join the Union but held to its demand of the Nueces River as a boundary. While the Mexican government could not reasonably have expected the Polk Administration to accept such terms, it would have had reason to hope that
7872-400: The United States. Nicholas Trist negotiated the peace talks; Trist, the chief clerk of the U.S. State Department , accompanied General Winfield Scott as a diplomat and President James K. Polk 's representative. After two previous unsuccessful attempts to negotiate a treaty with General José Joaquín de Herrera , Trist and General Scott determined that the only way to deal with Mexico was as
7995-566: The acquired territories) failed 15–38 on sectional lines. The treaty was leaked to John Nugent before the U.S. Senate could approve it. Nugent published his article in the New York Herald and, afterward, was questioned by senators. He was detained in a Senate committee room for one month, though he continued to file articles for his newspaper and ate and slept at the home of the sergeant at arms. Nugent did not reveal his source, and senators eventually gave up their efforts. The treaty
8118-516: The ages of supercentenarians (people at least 110 years old or older) by finding proof-of-age documents. People that have attained supercentenarian status are required to supply the organization documents that prove the persons birth date, change of name (if applicable), and date of death (if applicable), along with another piece of official government identification. Researchers from the GRG then verify that these documents are true and correct and if they are,
8241-519: The amendment was defeated 44–11. An amendment by Whig Sen. George Edmund Badger of North Carolina to exclude New Mexico and California lost 35–15, with three Southern Whigs voting with the Democrats. Daniel Webster was bitter that four New England senators made deciding votes for acquiring the new territories. A motion to insert into the treaty the Wilmot Proviso (banning slavery from
8364-769: The birthplace of the Internet, as the first ARPANET transmission was sent from the University of California, Los Angeles (UCLA) to the Stanford Research Institute in Menlo Park . In 1973, Tom Bradley was elected as the city's first African American mayor, serving for five terms until retiring in 1993. Other events in the city during the 1970s included the Symbionese Liberation Army 's South Central standoff in 1974 and
8487-632: The boundary between the Pacific Plate and the North American Plate , passes through the Los Angeles metropolitan area. The segment of the fault passing through Southern California experiences a major earthquake roughly every 110 to 140 years, and seismologists have warned about the next "big one", as the last major earthquake was the 1857 Fort Tejon earthquake . The Los Angeles basin and metropolitan area are also at risk from blind thrust earthquakes . Major earthquakes that have hit
8610-485: The boundary of a Mediterranean climate ( Köppen : Csb on the coast, Csa otherwise). Daytime temperatures are generally temperate all year round. In winter, they average around 68 °F (20 °C). Autumn months tend to be hot, with major heat waves a common occurrence in September and October, while the spring months tend to be cooler and experience more precipitation. Los Angeles has plenty of sunshine throughout
8733-466: The capital. On 30 May 1848, when the two countries exchanged ratifications of the treaty of Guadalupe Hidalgo, they further negotiated a three-article protocol to explain the amendments. The first article stated that the original Article IX of the treaty, although replaced by Article III of the Treaty of Louisiana , would still confer the rights delineated in Article IX. The second article confirmed
8856-404: The city as the most polluted in the country with short-term particle pollution and year-round particle pollution. In 2008, the city was ranked the second most polluted and again had the highest year-round particulate pollution. The city met its goal of providing 20 percent of the city's power from renewable sources in 2010. The American Lung Association's 2013 survey ranks the metro area as having
8979-537: The city is 342 miles (550 km). Los Angeles is both flat and hilly. The highest point in the city proper is Mount Lukens at 5,074 ft (1,547 m), located in the foothills of the San Gabriel Mountains at the north extent of the Crescenta Valley . The eastern end of the Santa Monica Mountains stretches from Downtown to the Pacific Ocean and separates the Los Angeles Basin from
9102-504: The city, causing $ 12.5 billion in damage and 72 deaths. The century ended with the Rampart scandal , one of the most extensive documented cases of police misconduct in American history. In 2002, Mayor James Hahn led the campaign against secession, resulting in voters defeating efforts by the San Fernando Valley and Hollywood to secede from the city. In 2022 , Karen Bass became the city's first female mayor , making Los Angeles
9225-497: The city. However, between 1908 and 1915, the Los Angeles City Council created various exceptions to the broad proscriptions that applied to these three residential zones, and as a consequence, some industrial uses emerged within them. There are two differences between the 1908 Residence District Ordinance and later zoning laws in the United States. First, the 1908 laws did not establish a comprehensive zoning map as
9348-499: The claimant is included in the GRG's official tables of validated supercentenarians. The GRG also conducts research on aging by interviewing supercentenarians and collecting blood and DNA samples. To 2015, the Gerontology Research Group found proofs of supercentenarian age for more than 2,000 people. Los Angeles Los Angeles , often referred to by its initials L.A. , is the most populous city in
9471-480: The country's largest oil producer, accounting for about one-quarter of the world's petroleum output. By 1900, the population had grown to more than 102,000, putting pressure on the city's water supply . The completion of the Los Angeles Aqueduct in 1913, under the supervision of William Mulholland , ensured the continued growth of the city. Because of clauses in the city's charter that prevented
9594-477: The demise of the city's privately owned electrified rail system , once the world's largest. As a consequence of World War II, suburban growth, and population density, many amusement parks were built and operated in this area. An example is Beverly Park , which was located at the corner of Beverly Boulevard and La Cienega before being closed and substituted by the Beverly Center . In the second half of
9717-617: The difference between the average daily low and the average daily high is over 30 °F (17 °C). The average annual temperature of the sea is 63 °F (17 °C), from 58 °F (14 °C) in January to 68 °F (20 °C) in August. Hours of sunshine total more than 3,000 per year, from an average of 7 hours of sunshine per day in December to an average of 12 in July. Due to
9840-494: The entire state of Texas (1845), which then included part of Kansas (1861); Colorado (1876); Wyoming (1890); Oklahoma (1907); and New Mexico (1912). The area of domain acquired was given by the Federal Interagency Committee as 338,680,960 acres. The cost was $ 16,295,149 or approximately 5 cents an acre. The remainder (the southern parts) of New Mexico and Arizona were peacefully purchased under
9963-469: The era of Spanish colonization). The historic center of Tongva power in the region was the settlement of Yaanga ( Tongva : Iyáangẚ ), meaning "place of the poison oak ", which would one day be the site where the Spanish founded the Pueblo de Los Ángeles . Iyáangẚ has also been translated as "the valley of smoke". Maritime explorer Juan Rodríguez Cabrillo claimed the area of southern California for
10086-401: The extension acquired by the boundaries of the United States" and agreed to pay debts owed to American citizens by the Mexican government. Mexicans in areas annexed by the U.S. could relocate within Mexico's new boundaries or receive American citizenship and full civil rights. The United States ratified the treaty on 10 March and Mexico on 19 May. The ratifications were exchanged on 30 May, and
10209-407: The form of moderate rain showers, but sometimes as heavy rainfall during winter storms. Rainfall is usually higher in the hills and coastal slopes of the mountains because of orographic uplift. Summer days are usually rainless. Rarely, an incursion of moist air from the south or east can bring brief thunderstorms in late summer, especially to the mountains. The coast gets slightly less rainfall, while
10332-436: The government with the consent of Congress cede a portion of territory? Is it suitable to make peace upon the terms which have been proposed? The first question was resolved based upon the principle that congress was the deposit of the national sovereignty. The second question was resolved upon the consideration that Mexico had never been in full possession of the territories that were about to be ceded, and that most of that land
10455-565: The industry kept the city insulated from much of the economic loss suffered by the rest of the country during the Great Depression . By 1930, the population surpassed one million. In 1932, the city hosted the Summer Olympics . During World War II Los Angeles was a major center of wartime manufacturing, such as shipbuilding and aircraft. Calship built hundreds of Liberty Ships and Victory Ships on Terminal Island, and
10578-521: The inland and mountain areas get considerably more. Years of average rainfall are rare. The usual pattern is a year-to-year variability, with a short string of dry years of 5–10 in (130–250 mm) rainfall, followed by one or two wet years with more than 20 in (510 mm). Wet years are usually associated with warm water El Niño conditions in the Pacific, dry years with cooler water La Niña episodes. A series of rainy days can bring floods to
10701-575: The largest U.S. city to have ever had a woman as mayor. Los Angeles will host the 2028 Summer Olympics and Paralympic Games , making Los Angeles the third city to host the Olympics three times. The city of Los Angeles covers a total area of 502.7 square miles (1,302 km ), comprising 468.7 square miles (1,214 km ) of land and 34.0 square miles (88 km ) of water. The city extends for 44 miles (71 km) from north to south and for 29 miles (47 km) from east to west. The perimeter of
10824-671: The legitimacy of land grants pursuant to Mexican law. The protocol further noted that the Mexican Minister of Foreign Affairs had accepted said explanations on behalf of the Mexican Government, and was signed in Querétaro by A. H. Sevier, Nathan Clifford and Luis de la Rosa . The United States would later ignore the protocol on the grounds that the U.S. representatives had over-reached their authority in agreeing to it. The Treaty of Mesilla , which concluded
10947-490: The lowest is 28 °F (−2 °C), on January 4, 1949. Within the City of Los Angeles, the highest temperature ever officially recorded is 121 °F (49 °C), on September 6, 2020, at the weather station at Pierce College in the San Fernando Valley neighborhood of Woodland Hills . During autumn and winter, Santa Ana winds sometimes bring much warmer and drier conditions to Los Angeles, and raise wildfire risk. Owing to geography, heavy reliance on automobiles, and
11070-505: The lowlands and mudslides to the hills, especially after wildfires have denuded the slopes. Both freezing temperatures and snowfall are extremely rare in the city basin and along the coast, with the last occurrence of a 32 °F (0 °C) reading at the downtown station being January 29, 1979; freezing temperatures occur nearly every year in valley locations while the mountains within city limits typically receive snowfall every winter. The greatest snowfall recorded in downtown Los Angeles
11193-530: The most common one, / l ɒ s ˈ æ n dʒ ɪ l iː z / , as a spelling pronunciation based on analogy to Greek words ending in -es , "reflecting a time when the classics were familiar if Spanish was not". The settlement of Indigenous Californians in the modern Los Angeles Basin and the San Fernando Valley was dominated by the Tongva (now also known as the Gabrieleño since
11316-546: The mountainous terrain of the surrounding region, the Los Angeles area contains a large number of distinct microclimates , causing extreme variations in temperature in close physical proximity to each other. For example, the average July maximum temperature at the Santa Monica Pier is 70 °F (21 °C) whereas it is 95 °F (35 °C) in Canoga Park, 15 miles (24 km) away. The city, like much of
11439-592: The mouth of the Gila to one marine league south of the southernmost point of the Port of San Diego , slightly north of the previous Mexican provincial boundary at Playas de Rosarito . Comparing the boundary in the Adams–Onís Treaty to the Guadalupe Hidalgo boundary, Mexico conceded about 55% of its pre-war, pre-Texas territorial claims and now has an area of 1,972,550 km (761,610 sq mi). In
11562-508: The movement did not draw widespread support. President Polk's State of the Union address in December 1847 upheld Mexican independence and argued at length that occupation and any further military operations in Mexico were aimed at securing a treaty ceding California and New Mexico up to approximately the 32nd parallel north and possibly Baja California and transit rights across the Isthmus of Tehuantepec . Despite several military defeats,
11685-614: The name of the city has varied over time. A 1953 article in the journal of the American Name Society asserts that the pronunciation / l ɔː s ˈ æ n dʒ əl ə s / lawss AN -jəl-əs was established following the 1850 incorporation of the city and that since the 1880s the pronunciation / l oʊ s ˈ æ ŋ ɡ əl ə s / lohss ANG -gəl-əs emerged from a trend in California to give places Spanish, or Spanish-sounding, names and pronunciations. In 1908, librarian Charles Fletcher Lummis , who argued for
11808-483: The name's pronunciation with a hard g ( / ɡ / ), reported that there were at least 12 pronunciation variants. In the early 1900s, the Los Angeles Times advocated for pronouncing it Loce AHNG-hayl-ais ( / l oʊ s ˈ ɑː ŋ h eɪ l eɪ s / ), approximating Spanish [los ˈaŋxeles] , by printing the respelling under its masthead for several years. This did not find favor. Since
11931-473: The nation's worst smog, and fourth in both short-term and year-round pollution amounts. Treaty of Guadalupe Hidalgo The Treaty of Guadalupe Hidalgo officially ended the Mexican–American War (1846–1848). It was signed on 2 February 1848 in the town of Guadalupe Hidalgo . After the defeat of its army and the fall of the capital in September 1847, Mexico entered into peace negotiations with
12054-691: The number of border markers from 6 to 53. Most of these markers were simply piles of stones. Two later conventions, in 1882 and 1889, further clarified the boundaries, as some of the markers had been moved or destroyed. Photographers were brought in to document the location of the markers. These photographs are in Record Group 77, Records of the Office of the Chief Engineers, in the National Archives. The southern border of California
12177-514: The passage of early national environmental legislation, including the Clean Air Act . When the act was passed, California was unable to create a State Implementation Plan that would enable it to meet the new air quality standards, largely because of the level of pollution in Los Angeles generated by older vehicles. More recently, the state of California has led the nation in working to limit pollution by mandating low-emission vehicles . Smog
12300-539: The purpose of the acquisition. Mexico had claimed the area in question since winning its independence from the Spanish Empire in 1821 following the Mexican War of Independence . The Spanish had conquered part of the area from the American Indian tribes over the preceding three centuries. Still, powerful and independent indigenous nations remained within that northern region of Mexico. Most of that land
12423-563: The rest of the surrounding landscape. Most construction is done in separate units, rather than wall-to-wall . However, Downtown Los Angeles itself has many buildings over 30 stories, with fourteen over 50 stories, and two over 70 stories, the tallest of which is the Wilshire Grand Center . Los Angeles has a two-season semi-arid climate ( Köppen : BSh ) with dry summers and very mild winters, but it receives more annual precipitation than most semi-arid climates, narrowly missing
12546-432: The safety of existing property rights of Mexican citizens living in the transferred territories. Despite assurances to the contrary, land grants by the Mexican government to its citizens were often not honored by the United States because of unilateral modifications to and interpretations of the Treaty and U.S. legal decisions. Land disputes between the descendants of Mexican land owners and Anglo Americans continued into
12669-530: The sale of Alta California north of the 37th parallel north — north of Santa Cruz, California and Madera, California and the southern boundaries of today's Utah and Colorado. Anglo-American settlers already dominated this territory, but perhaps more importantly from the Mexican point of view, it represented the bulk of pre-war Mexican territory north of the Missouri Compromise line of parallel 36°30′ north — lands that, if annexed by
12792-483: The sale of land, the treaty also provided recognition of the Rio Grande as the boundary between the state of Texas and Mexico. The land boundaries were established by a survey team of appointed Mexican and American representatives, and published in three volumes as the United States and Mexican Boundary Survey . On 30 December 1853, the countries, by agreement, altered the border from the initial one by increasing
12915-472: The sectional conflict the Mexicans hoped for. Jefferson Davis advised Polk that if Mexico appointed commissioners to come to the United States, the government that appointed them would probably be overthrown before they completed their mission, and they would likely be shot as traitors on their return; so that the only hope of peace was to have a U.S. representative in Mexico. Nicholas Trist, chief clerk of
13038-518: The signing of the "Capitulation Agreement" at " Campo de Cahuenga " and the end of the Taos Revolt . By the middle of September 1847, U.S. forces had successfully invaded central Mexico and occupied Mexico City. Some Eastern Democrats called for complete annexation of Mexico and recalled that a group of Mexico's leading citizens had invited General Winfield Scott to become dictator of Mexico after his capture of Mexico City (he declined). However,
13161-506: The treaty was proclaimed on 4 July 1848. The U.S. Senate ratified the treaty by a vote of 38–14. The opponents of this treaty were led by the Whigs , who had opposed the war and rejected manifest destiny in general, and rejected this expansion in particular. The amount of land gained by the United States from Mexico was further increased due to the Gadsden Purchase of 1853, which ceded parts of present-day southern Arizona and New Mexico to
13284-434: The world, after New York and Tokyo . Los Angeles hosted the Summer Olympics in 1932 and 1984 , and will also host in 2028 . Despite a business exodus from Downtown Los Angeles since the COVID-19 pandemic , the city's urban core is evolving as a cultural center with the world's largest showcase of architecture designed by Frank Gehry . On September 4, 1781, a group of 44 settlers known as " Los Pobladores " founded
13407-635: The worst rush hour periods in the world, according to an annual traffic index by navigation system maker, TomTom . LA drivers spend an additional 92 hours in traffic each year. During the peak rush hour, there is 80% congestion, according to the index. Los Angeles is often characterized by the presence of low-rise buildings, in contrast to New York City. Outside of a few centers such as Downtown , Warner Center , Century City , Koreatown , Miracle Mile , Hollywood, and Westwood , skyscrapers and high-rise buildings are not common in Los Angeles. The few skyscrapers built outside of those areas often stand out above
13530-582: The year, with an average of only 35 days with measurable precipitation annually. Temperatures in the coastal basin exceed 90 °F (32 °C) on a dozen or so days in the year, from one day a month in April, May, June and November to three days a month in July, August, October and to five days in September. Temperatures in the San Fernando and San Gabriel Valleys are considerably warmer. Temperatures are subject to substantial daily swings; in inland areas
13653-447: Was incorporated as a municipality on April 4, 1850, five months before California achieved statehood . The discovery of oil in the 1890s brought rapid growth to the city. The city was further expanded with the completion of the Los Angeles Aqueduct in 1913, which delivers water from Eastern California . Los Angeles has a diverse economy with a broad range of industries. Despite a steep exodus of film and television production since
13776-502: Was 2.0 inches (5 cm) on January 15, 1932. While the most recent snowfall occurred in February 2019, the first snowfall since 1962, with snow falling in areas adjacent to Los Angeles as recently as January 2021. Brief, localized instances of hail can occur on rare occasions, but are more common than snowfall. At the official downtown station, the highest recorded temperature is 113 °F (45 °C) on September 27, 2010, while
13899-566: Was designated as a line from the junction of the Colorado and Gila rivers westward to the Pacific Ocean so that it passes one Spanish league south of the southernmost portion of San Diego Bay. This was done to ensure that the United States received San Diego and its excellent natural harbor. The treaty extended the choice of U.S. citizenship to Mexicans in the newly purchased territories before many African Americans, Asians, and Native Americans were eligible. If they chose to, they had to declare to
14022-431: Was either not populated, or populated by hostile indigenous tribes. It was also taken into account that Mexico could not continue the war without facing certain defeat and risking the loss of the entire country. After the commission reported its findings, the Treaty of Guadalupe Hidalgo was approved by congress. President Peña y Peña prepared decrees to prevent disorder in the capital once the occupiers left and to establish
14145-502: Was formalized in the Treaty of Guadalupe Hidalgo in 1848, which ceded Los Angeles and the rest of Alta California to the United States. Railroads arrived with the completion of the transcontinental Southern Pacific line from New Orleans to Los Angeles in 1876 and the Santa Fe Railroad in 1885. Petroleum was discovered in the city and surrounding area in 1892, and by 1923, the discoveries had helped California become
14268-463: Was founded in 1990 by L. Stephen Coles and Stephen M. Kaye. The original chapter of the LA-GRG holds meetings each month, though the organization has members worldwide who meet via online forums and video meetings. The GRG's current director, upon the death of Dr L Stephen Coles, is John M Adams, known as Johnny. Lead in supercentenarian research for the GRG is Robert Douglas Young. The GRG validates
14391-474: Was founded on September 4, 1781, under Spanish governor Felipe de Neve , on the village of Yaanga . It became a part of the First Mexican Empire in 1821 following the Mexican War of Independence . In 1848, at the end of the Mexican–American War , Los Angeles and the rest of California were purchased as part of the Treaty of Guadalupe Hidalgo and became part of the United States. Los Angeles
14514-522: Was occupied, and were now faced with the task of negotiating the treaty while dealing with separatism and anarchy spreading throughout the country. The Caste War was ongoing in Yucatán, and the insurgents in that conflict had occupied the major cities. Many states considered the federal government to be an enemy and refused to pay taxes. Meanwhile, most notably in the Federal District there was
14637-418: Was signed by Nicholas Trist (on behalf of the United States) and Luis G. Cuevas, Bernardo Couto, and Miguel Atristain as plenipotentiary representatives of Mexico on 2 February 1848 at the main altar of the old Basilica of Guadalupe at Villa Hidalgo (within the present city limits) as U.S. troops under the command of Gen. Winfield Scott were occupying Mexico City . The version of the treaty ratified by
14760-676: Was signed on 15 June 1846. By avoiding any chance of conflict with Great Britain, the United States was given a free hand regarding Mexico. After the Thornton Affair of 25–26 April, when Mexican forces attacked an American unit in the disputed area, with the result that 11 Americans were killed, five wounded, and 49 captured, Congress passed a declaration of war, which Polk signed on 13 May 1846. The Mexican Congress responded with its own war declaration on 23 April 1846. U.S. forces quickly moved beyond Texas to conquer Alta California, and New Mexico. Fighting there ended on 13 January 1847 with
14883-599: Was subsequently ratified by the U.S. Senate by a vote of 38 to 14 on 10 March 1848 and by Mexico through a legislative vote of 51 to 34 and a Senate vote of 33 to 4, on 19 May 1848. News that New Mexico's legislative assembly had just passed an act for the organization of a U.S. territorial government helped ease Mexican concern about abandoning the people of New Mexico. The treaty was formally proclaimed on 4 July 1848. The Mexican Congress and President Manuel de la Peña y Peña met at Querétaro City in May, 1848 while Mexico City
15006-573: Was to disrupt the American supply chain from Veracruz to the capital. This was also leading to indiscriminate American reprisals. As the peace treaty was concluded and the occupiers were on the point of leaving the country, congress named Jose Joaquin Herrera to the presidency of the republic, and Peña y Peña left his post as president in exchange for the presidency of the Supreme Court on 3 June 1848. The government left Querétaro and returned to
15129-502: Was too dry and too mountainous to support a large population. About 80,000 Mexicans inhabited California, New Mexico, Arizona, and Texas during the period 1845 to 1850, with far fewer in Nevada , southern and western Colorado, and Utah. On 1 March 1845, U.S. President John Tyler signed legislation to authorize the United States to annex the Republic of Texas , effective on 29 December 1845. The Mexican government, which had never recognized
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