Philadelphia, colloquially referred to as Philly, is the
most populous city in the U.S. state of Pennsylvania
and the sixth-most populous city in the United States,
with a population of 1,603,797 in the 2020 census. The
city is the urban core of the larger Delaware Valley,
also known as the Philadelphia metropolitan area, the
eighth-largest metropolitan region in the nation with
6.245 million residents in its metropolitan statistical
area, and 7.366 million residents in its combined
statistical area.
Philadelphia has played an extensive role in United
States history. The city was founded in 1682 by William
Penn, an English Quaker and advocate of religious freedom.
The city served as the capital of the Pennsylvania Colony
during the British colonial era[3][13] and went on to play
a historic and vital role as the central meeting place for
the nation’s founding fathers during the American Revolution
and subsequent Revolutionary War. Philadelphia hosted the
First Continental Congress in 1774, preserved the Liberty
Bell, and hosted the Second Continental Congress during
which the nation’s 56 founders formed the Continental Army
and elected George Washington as its commander in 1775, and
unanimously adopted the Declaration of Independence on July
4, 1776. For nine months, from September 1777 to June 1778,
the city fell under British occupation during the war’s
Philadelphia campaign.[14] In 1787, the U.S. Constitution
was ratified in Philadelphia at the Philadelphia Convention.
Philadelphia remained the nation’s largest city until 1790,
and it served as the nation’s first capital from May 10,
1775, until December 12, 1776, and on four subsequent
occasions until 1800, when construction of the new national
capital in Washington, D.C. was completed.
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