Philadelphia  is the largest city in the Commonwealth of Pennsylvania, the second largest city on the East Coast of the United States, and the fifth-most-populous city in the United States. It is located in the Northeastern United States at the confluence of the Delaware and Schuylkill rivers, and it is the only consolidated city-county in Pennsylvania. As of the 2010 Census, the city had a population of 1,526,006, growing to 1,547,607 in 2012 by Census estimates. Philadelphia is the economic and cultural center of the Delaware Valley, home to over 6 million people and the country's sixth-largest metropolitan area. Within the Delaware Valley, the Philadelphia metropolitan division consists of five counties in Pennsylvania and has a population of 4,008,994. Popular nicknames for Philadelphia are Philly and The City of Brotherly Love, the latter of which comes from the literal meaning of the city's name in Greek , Modern Greek: "brotherly love", compounded from philos "loving", and adelphos "brother").In 1682, William Penn founded the city to serve as capital of Pennsylvania Colony. By the 1750s, Philadelphia had surpassed Boston to become the largest city and busiest port in British America, and second in the British Empire, behind London. During the American Revolution, Philadelphia played an instrumental role as a meeting place for the Founding Fathers of the United States, who signed the Declaration of Independence in 1776 and the Constitution in 1787. Philadelphia was one of the nation's capitals during the Revolutionary War, and the city served as the temporary U.S. capital while Washington, D.C., was under construction. During the 19th century, Philadelphia became a major industrial center and railroad hub that grew from an influx of European immigrants. It became a prime destination for African Americans during the Great Migration and surpassed two million occupants by 1950.

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