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Philadelphia is the largest city in Pennsylvania and the sixth-most-populous city in the United States. The city was the social and geographical center of the original 13 American colonies. It was in this city that many of the ideas, and subsequent actions, gave birth to the American Revolution and American Independence, making Philadelphia a centerpiece of early American history.Two airports serve Philadelphia: the Philadelphia International Airport, straddling the southern boundary of the city, and the Northeast Philadelphia Airport, a general aviation reliever airport in Northeast Philadelphia.