Philadelphia became the social, political and geographical center of the American colonies. In the late seventeen hundreds, many events that took place in Philadelphia gave birth to the American Revolution and independence. For example, the Declaration of Independence and the Constitution were signed in the city. 费城成为了美国殖民地的社会、政治和地理中心.18世纪末期,许多事件都发生在费城,催生了美国的革命和独立.例如,美国独立宣言和美国宪法都是在这个城市签署的.
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