Before Europeans arrived, the Philadelphia area was home to the Lenape (Delaware) Indians in the village of Shackamaxon. The Lenape are a Native American tribe and First Nations band government. They are also called Delaware Indians, and their historical territory was along the Delaware River watershed, western Long Island, and the Lower Hudson Valley.[a] Most Lenape were pushed out of their Delaware homeland during the 18th century by expanding European colonies, exacerbated by losses from intertribal conflicts. Lenape communities were weakened by newly introduced diseases, mainly smallpox, and violent conflict with Europeans. Iroquois people occasionally fought the Lenape. Surviving Lenape moved west into the upper Ohio River basin. The American Revolutionary War and United States' independence pushed them further west. In the 1860s, the United States government sent most Lenape remaining in the eastern United States to the Indian Territory (present-day Oklahoma and surrounding territory) under the Indian removal policy. In the 21st century, most Lenape reside in Oklahoma, with some communities living also in Wisconsin, Ontario (Canada), and in their traditional homelands.
Europeans came to the Delaware Valley in the early 17th century, with the first settlements founded by the Dutch, who in 1623 built Fort Nassau on the Delaware River opposite the Schuylkill River in what is now Brooklawn, New Jersey. The Dutch considered the entire Delaware River valley to be part of their New Netherland colony. In 1638, Swedish settlers led by renegade Dutch established the colony of New Sweden at Fort Christina (present-day Wilmington, Delaware) and quickly spread out in the valley. In 1644, New Sweden supported the Susquehannocks in their military defeat of the English colony of Maryland. In 1648, the Dutch built Fort Beversreede on the west bank of the Delaware, south of the Schuylkill near the present-day Eastwick neighborhood, to reassert their dominion over the area. The Swedes responded by building Fort Nya Korsholm, or New Korsholm, after a town in Finland with a Swedish majority. In 1655, a Dutch military campaign led by New Netherland Director-General Peter Stuyvesant took control of the Swedish colony, ending its claim to independence. The Swedish and Finnish settlers continued to have their own militia, religion, and court, and to enjoy substantial autonomy under the Dutch. The English conquered the New Netherland colony in 1664, though the situation did not change substantially until 1682 when the area was included in William Penn's charter for Pennsylvania.
In 1681, in partial repayment of a debt, Charles II of England granted Penn a charter for what would become the Pennsylvania colony. Despite the royal charter, Penn bought the land from the local Lenape to be on good terms with the Native Americans and ensure peace for his colony. Penn made a treaty of friendship with Lenape chief Tammany under an elm tree at Shackamaxon, in what is now the city's Fishtown neighborhood.
Penn named the city Philadelphia, which is Greek for "brotherly love," derived from the Ancient Greek terms φίλος phílos (beloved, dear) and ἀδελφός adelphós (brother, brotherly). As a Quaker, Penn had experienced religious persecution and wanted his colony to be a place where anyone could worship freely. This tolerance, far more than afforded by most other colonies, led to better relations with the local native tribes and fostered Philadelphia's rapid growth into America's most important city.
Penn planned a city on the Delaware River to serve as a port and place for government. Hoping that Philadelphia would become more like an English rural town instead of a city, Penn laid out roads on a grid plan to keep houses and businesses spread far apart, with areas for gardens and orchards. The city's inhabitants did not follow Penn's plans, however, as they crowded by the Delaware River port, and subdivided and resold their lots. Before Penn left Philadelphia for the last time, he issued the Charter of 1701 establishing it as a city. Though poor at first, the city became an important trading center with tolerable living conditions by the 1750s. Benjamin Franklin, a leading citizen, helped improve city services and founded new ones, such as fire protection, a library, and one of the American colonies' first hospitals.
A number of philosophical societies were formed, which were centers of the city's intellectual life: the Philadelphia Society for Promoting Agriculture (1785), the Pennsylvania Society for the Encouragement of Manufactures and the Useful Arts (1787), the Academy of Natural Sciences (1812), and the Franklin Institute (1824). These societies developed and financed new industries, attracting skilled and knowledgeable immigrants from Europe.
An 18th-century map of Philadelphia, circa 1752
Philadelphia's importance and central location in the colonies made it a natural center for America's revolutionaries. By the 1750s, Philadelphia had surpassed Boston to become the largest city and busiest port in British America, and second in the British Empire after London. The city hosted the First Continental Congress (1774) before the Revolutionary War; the Second Continental Congress (1775–76), which signed the United States Declaration of Independence, during the war; and the Constitutional Convention (1787) after the war. Several battles were fought in and near Philadelphia as well.
Philadelphia served as the temporary capital of the United States while the new capital was under construction in the District of Columbia from 1790 to 1800. In 1793, the largest yellow fever epidemic in U.S. history killed approximately 4,000 to 5,000 people in Philadelphia, or about 10% of the city's population.
The state capital was moved to Lancaster in 1799, then Harrisburg in 1812, while the federal government was moved to Washington, D.C. in 1800 upon completion of the White House and U.S. Capitol building. The city remained the young nation's largest until the late 18th century, being both a financial and a cultural center for America. In 1816, the city's free black community founded the African Methodist Episcopal Church (AME), the first independent black denomination in the country, and the first black Episcopal Church. The free black community also established many schools for its children, with the help of Quakers. New York City surpassed Philadelphia in population by 1790. Large-scale construction projects for new roads, canals, and railroads made Philadelphia the first major industrial city in the United States.
Throughout the 19th century, Philadelphia hosted a variety of industries and businesses, the largest being textiles. Major corporations in the 19th and early 20th centuries included the Baldwin Locomotive Works, William Cramp & Sons Shipbuilding Company, and the Pennsylvania Railroad. Industry, along with the U.S. Centennial, was celebrated in 1876 with the Centennial Exposition, the first official World's Fair in the United States.
Immigrants, mostly from Ireland and Germany, settled in Philadelphia and the surrounding districts. These immigrants were largely responsible for the first general strike in North America in 1835, in which workers in the city won the ten-hour workday. The city was a destination for thousands of Irish immigrants fleeing the Great Famine in the 1840s; housing for them was developed south of South Street and later occupied by succeeding immigrants. They established a network of Catholic churches and schools and dominated the Catholic clergy for decades. Anti-Irish, anti-Catholic nativist riots erupted in Philadelphia in 1844. The rise in population of the surrounding districts helped lead to the Act of Consolidation of 1854, which extended the city limits from the 2 square miles (5.2 km2) of Center City to the roughly 134 square miles (350 km2) of Philadelphia County.
In the latter half of the century, immigrants from Russia, Eastern Europe and Italy, and African Americans from the southern U.S. settled in the city.
Philadelphia was represented by the Washington Grays in the American Civil War. The African-American population of Philadelphia increased from 31,699 to 219,559 between 1880 and 1930. Twentieth-century black newcomers were part of the Great Migration out of the rural south to northern and midwestern industrial cities.
By the 20th century, Philadelphia had an entrenched Republican political machine and a complacent population. The first major reform came in 1917 when outrage over the election-year murder of a police officer led to the shrinking of the City Council from two houses to just one. In July 1919, Philadelphia was one of more than 36 industrial cities nationally to suffer a race riot of ethnic whites against blacks during Red Summer, in post-World War I unrest, as recent immigrants competed with blacks for jobs. In the 1920s, the public flouting of Prohibition laws, organized crime, mob violence, and police involvement in illegal activities led to the appointment of Brig. Gen. Smedley Butler of the U.S. Marine Corps as director of public safety, but political pressure prevented any long-term success in fighting crime and corruption.
In 1940, non-Hispanic whites constituted 86.8% of the city's population. The population peaked at more than two million residents in 1950, then began to decline with the restructuring of industry, which led to the loss of many middle-class union jobs. In addition, suburbanization had enticed many of the more affluent residents to outlying railroad commuting towns and newer housing. The resulting reduction in Philadelphia's tax base and the resources of local government caused the city to struggle through a long period of adjustment, with it approaching bankruptcy by the late 1980s.
Revitalization and gentrification of neighborhoods began in the late 1970s and continues into the 21st century, with much of the development occurring in the Center City and University City neighborhoods. After many of the old manufacturers and businesses left Philadelphia or shut down, the city started attracting service businesses and began to market itself more aggressively as a tourist destination. Contemporary glass-and-granite skyscrapers were built in Center City beginning in the 1980s. Historic areas such as Old City and Society Hill were renovated during the reformist mayoral era of the 1950s through the 1980s, making those areas among the most desirable neighborhoods in Center City. These developments have begun a reversal of the city's population decline between 1950 and 2000 during which it lost about one-quarter of its residents. The city eventually began experiencing a growth in its population in 2007, which has continued with gradual yearly increases to the present.