Philadelphia, Pennsylvania is the fifth-most-populous city in the United States and the largest in the Commonwealth of Pennsylvania, both in area and population. Since 1854, the city has been coterminous with Philadelphia County. Philadelphia has the second-largest downtown residential population in the U.S., behind New York, just edging out Chicago. The Philadelphia metropolitan area is the fourth-largest in the U.S. by the official definition, with some 6.9 million people. Philadelphia is the central city of the Delaware Valley metropolitan area.
Philadelphia is one of the oldest and most historically significant U.S. cities. It was the nation's first capital. At the time of the American Revolution, it was the second-largest English-speaking city in the world, after only London. Into the first part of the 19th century, it was the country's most populous city and eclipsed Boston and New York City in political and social importance. Benjamin Franklin played an extraordinary role in Philadelphia's rise.
- October 4, 1777 - American Revolutionary War: British troops repel an attack by General George Washington at the Battle of Germantown.
- October 7, 1952 - Bandstand, later called American Bandstand, premieres on WFIL-TV.
- October 25, 1701 – William Penn issues the Charter of 1701, establishing Philadelphia as a city.
- October 25, 1918 - The Benjamin Franklin Parkway opens to automobile traffic for the first time.
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- Official Government Website
- Greater Philadelphia Tourism Marketing Corporation
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- List of Nobel Laureates affiliated with the University of Pennsylvania
- List of Philadelphia Phillies managers
- List of Philadelphia 76ers head coaches
- List of Philadelphia Eagles first-round draft picks
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