When the Union was formed, African negroes were held in servitude in all but two of the States. At the time of this debate, slavery had been abolished, or was on the way to ultimate extinction, in every State north of Maryland and Delaware. Climate rather than humanitarian considerations sealed the fate of slavery at the North; and climate, in the last analysis, fastened African slavery on the South. As the South became committed to the raising of a staple, and that staple cotton, the negro was regarded as an indispensable factor in plantation economy. There were far-sighted individuals, it is true, who deprecated slavery on humanitarian grounds; but they were, for the most part, citizens of border States where the profitableness of negro labor was less apparent. Even in these communities opposition to slavery was tempered by dread of what emancipation might bring in its train. The history of Santo Domingo revealed the hideous possibilities of a negro insurrection. No father of a family could contemplate with equanimity the proximity of a large body of free, semi-civilized blacks. For a time even prominent slaveholders favored the aims of the Colonization Society which proposed to deport emancipated blacks to the African coast. So late as 1820 the Governor of Virginia recommended an appropriation by the legislature for the emancipation and removal of the negroes. Although slavery was a local institution, and regulated by state law, its existence was recognized by the Federal Convention of 1787. The arrangement which obtained under the old Confederation, whereby five slaves were to count as three whites in apportioning representation and taxes, was continued; the mutual obligation of the States to return fugitives from justice and labor was distinctly stated in the Constitution; and the slave trade was permitted to continue at least to the year 1808. In 1793, Congress had met its constitutional obligations by enacting a law for the return of fugitive slaves; and in 1794, Congress passed an act--"the first national act against the slave trade"--which prohibited all trade in slaves from the United States to any foreign country. By the opening of the new century all the States had forbidden the importation of slaves from abroad. But in 1803, South Carolina again legalized the slave trade; and in 1805, Congress after a brief interdiction removed all restrictions upon the importation of slaves into the Louisiana Territory. The slave trade at once assumed alarming proportions. It was officially stated that between 1803 and 1807, 39,075 negroes were brought into the port of Charleston. Eighteen hundred of these unfortunate blacks were imported in American vessels. One half of the consignees of these slavers were Americans, of whom thirteen were natives of Charleston and eighty-eight of Rhode Island.