1860 3,953,760 488,070 4,441,830 11% 31,443,321 14% The Residence Act specified that the capital be located along the Potomac River between the Eastern Branch (the Anacostia River) and the Connogochegue (near Williamsport and Hagerstown Maryland) and encompass an area of no more than "ten miles square" (10 miles (16 km) on a side for a maximum area of 100 square miles (259 km2)).[citation needed]; ! .
. . By January 1 1808 when Congress banned further imports South Carolina was the only state that still allowed importation of slaves Congress allowed continued trade only in slaves who were descendants of those currently in the United States in addition US citizens could participate financially in the international slave trade and the outfitting of ships for that trade the domestic slave trade became extremely profitable as demand rose with the expansion of cultivation in the Deep South for cotton and sugar cane crops Slavery in the United States became more or less self-sustaining by natural increase among the current slaves and their descendants; . . . Washington D.C. Business Directory, John Hart New Jersey 2 Yes 6 Congress and the public.
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