If this were not the case, the framers of the Constitution had expended much labor in vain. Had they imagined that Congress would possess no power to prohibit the trade either before or after 1808, they would not have taken so much care to protect the States against the exercise of this power before that period. Nay, more, they would not have attached such vast importance to this provision as to have excluded it from the possibility of future repeal or amendment, to which other portions of the Constitution were exposed. It would, then, have been wholly unnecessary to ingraft on the fifth article of the Constitution, prescribing the mode of its own future amendment, the proviso "that no amendment which may be made prior to the year 1808 shall in any manner affect" the provision in the Constitution securing to the States the right to admit the importation of African slaves previous to that period. According to the adverse construction, the clause itself, on which so much care and discussion had been employed by the members of the Convention, was an absolute nullity from the beginning, and all that has since been done under it a mere usurpation. It was well and wise to confer this power on Congress, because had it been left to the States its efficient exercise would have been impossible. In that event any one State could have effectually continued the trade, not only for itself, but for all the other slave States, though never so much against their will. And why? Because African slaves, when once brought within the limits of any one State in accordance with its laws, can not practically be excluded from any State where slavery exists. And even if all the States had separately passed laws prohibiting the importation of slaves, these laws would have failed of effect for want of a naval force to capture the slavers and to guard the coast. Such a force no State can employ in time of peace without the consent of Congress. These acts of Congress, it is believed, have, with very rare and insignificant exceptions, accomplished their purpose. For a period of more than half a century there has been no perceptible addition to the number of our domestic slaves. During this period their advancement in civilization has far surpassed that of any other portion of the African race. The light and the blessings of Christianity have been extended to them, and both their moral and physical condition has been greatly improved. Reopen the trade and it would be difficult to determine whether the effect would be more deleterious on the interests of the master or on those of the native-born slave. Of the evils to the master, the one most to be dreaded would be the introduction of wild, heathen, and ignorant barbarians among the sober, orderly, and quiet slaves whose ancestors have been on the soil for several generations. This might tend to barbarize, demoralize, and exasperate the whole mass and produce most deplorable consequences.