NY's Federal Hall (corner of Wall Street and Nassau Street) is the birthplace of the Bill of Rights and the first capitol of the United States. At this place, the government of the United States of America, under our present Constitution, began to function on Wednesday, March 4, 1789, with the first Senate in one wing and the first House of Representatives in the other.
Alos, George Washington was inaugurated President here in 1789.
Since Federal Hall was no longer big enough to serve the city government's needs, the Federal Government moved to Philadelphia in 1790, and on to Washington, D.C. in 1800.
Also, before there was a capitol in Washington, DC, congress met in Philadelphia, Pennsylvania; Baltimore, Maryland; Lancaster, Pennsylvania; York, Pennsylvania; Princeton, New Jersey; Annapolis, Maryland; Trenton, New Jersey; and New York, New York.