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Wikipedia says this about Philadelphia

Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania,^[6] the sixth largest city in the U.S., the second largest city in the Northeast megalopolis (behind New York City), and the 68th largest city in the world. Since 1854, the city has had the same geographic boundaries as Philadelphia County, the most populous county in Pennsylvania and the urban core of the Delaware Valley, the nation's seventh-largest and world's 35th-largest metropolitan region, with 6.096 million residents as of 2020.^[9] The city's population as of the 2020 census was 1,603,797.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era.^[4][10] Philadelphia went on to play a historic and vital role in the 18th century as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired and resulted in the American Revolution. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history".^[11] Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits.

The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775 until December 12, 1776 and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C. was under construction.

In the 19th and 20th centuries, Philadelphia became a major national industrial center and railroad hub. Its industrial jobs attracted European immigrants, most of whom initially came from Germany and Ireland, the two largest reported ancestry groups in the city as of 2015. Later immigrant groups in the 20th century came from Italy and other Southern European and Eastern European countries.^[12] In the early 20th century, Philadelphia became a prime destination for African Americans during the Great Migration after the American Civil War.^[13] Puerto Ricans began moving to the city in large numbers in the period between World War I and II, and in even greater numbers in the post-war period.^[14] The city's population doubled from one million to two million people between 1890 and 1950.