Answer: The Residence Act of July 16, 1790, put the nation's capital in current-day Washington as part of a plan to appease pro-slavery states who feared a northern capital as being too sympathetic to abolitionists.
The City of Brotherly Love became the ex-capital for several reasons: the machinations of Alexander Hamilton and Thomas Jefferson; the compromise over slavery; a concern about public health; and a grudge against the Pennsylvania state government were all factors in the move.
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