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>BREAKING: The Trump campaign has opened their first Pennsylvania field office in Philadelphia because Trump wants to win the state in style by flipping Black & Hispanic voters.
Philadelphia quickly grew into an important colonial city and during the American Revolution was the site of the First and Second Continental Congresses. After the Revolution the city was chosen to be the temporary capital of the United States.
After the American Revolutionary War began in April 1775 following the Battles of Lexington and Concord, the Second Continental Congress met in May at the Pennsylvania State House. There, they also met a year later to write and sign the Declaration of Independence in July 1776. Philadelphia was important to the war effort; Robert Morris said,
You will consider Philadelphia, from its centrical situation, the extent of its commerce, the number of its artificers, manufactures and other circumstances, to be to the United States what the heart is to the human body in circulating the blood.
https://en.m.wikipedia.org/wiki/History_of_Philadelphia