Thus, by timely and well-considered concessions on each side, was the slave-trade brought immediately within the revenue power of the general government, and also, at the expiration of twenty years, within its power to regulate commerce. By the same means, the commercial power, without any other restriction than that relating to the temporary toleration of the importation of slaves, was vested in a national majority. This result at once placed the foreign slave-trade by American vessels or citizens within the control of the national legislature, and enabled Congress to forbid the carrying of slaves to foreign countries; and at the end of the year 1808, it brought the whole traffic within the reach of a national prohibition.[228] Too high an estimate cannot well be formed, of the importance and value of this final settlement of conflicting sectional interests and demands. History has to thank the patriotism and liberality of the Northern States, for having acquired, for the government of the Union, by reasonable concessions, the power to terminate the African slave-trade. We know, from almost every day's experience since the founding of the government, that individual cupidity, which knows no geographical limits, which defies public opinion whether in the North or in the South, required and still requires the restraint and chastisement of national power. The separate authority of the States would have been wholly unequal to the suppression of the slave-trade: for even if they had all finally adopted the policy of a stringent prohibition, without a navy, and without treaties, they could never have contended against the bold artifice and desperate cunning of avarice, stimulated by the enormous gains which have always been reaped in this inhuman trade.