4        [Article 1, Sec 8]  “To exercise exclusive legislation in all cases whatsoever over such district (not exceeding ten miles square) as may, by cession of particular States and the acceptance of Congress, become the seat of the Government of the United States, and to exercise like authority over all places purchased by the consent of the legislature of the State in which the same shall be, for the erection of forts, magazines, arsenals, dockyards, and other needful buildings.” 

5        The seat of government must be independent.  If it was located in a State, that State might influence national councils.  Federal money will improve the capital.  This public trust should not be left in the hands of a single State.  And it would be nearly impossible to ever move the capital, which would further limit its independence.

          The size of this federal district is limited.  The State ceding the land for this use must consent.  The State will make a compact with the federal government, assuring the rights of the citizens of the district.  The inhabitants will have enough inducements to become willing parties to the cession.  An elected municipal legislature will exercise authority over them.  The legislature of the State and the people who live in the ceded part will agree to the cession and ratify the Constitution.  Therefore, this seems to cover every objection.

*quotes from The Federalist Papers: Modern English Edition Two