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Philadelphia (/fɪləˈdɛlfi.ə/ ⓘ fill-ə-DEL-fee-ə), colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania[11] 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 nation's eighth-largest metropolitan area and seventh-largest combined statistical area with 6.245 million residents and 7.366 million residents, respectively.[12]

Philadelphia has played an extensive and influential role in the nation's revolutionary founding and history. The city was founded in 1682 by William Penn, an English Quaker and advocate of religious freedom, and served as the capital of the colonial era Province of Pennsylvania.[3][13] The city went on to play a historic and vital role during the American Revolution and Revolutionary War, serving as the central meeting place for the nation's founding fathers, hosting the First Continental Congress in 1774, preserving the Liberty Bell, and hosting 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. During the Revolutionary War's Philadelphia campaign, the city briefly fell to the British Army, which occupied Philadelphia for nine months from September 1777 to June 1778.[14]