The Constitution furnished, however, an indirect way of reaching the desired result. It gave the Congress general powers within the Territories and did not restrict these powers in behalf of slavery. Congress might thus prohibit slavery in the Territories, and the Territories would thus become settled by a free population, an anti-slavery population, which would form Commonwealths at the proper time, in which the free status would be perpetuated by Commonwealth law. And when a sufficient number of free Commonwealths had been thus created to give the necessary majorities to amend the Constitution in the direction of abolition, slavery might be extinguished in the Commonwealths which had already legalized it. But the first difficulty in the way of the effectiveness of this line of action was the fact that Congress had already forfeited, in part, the opportunity, by failing to keep the southern portion of Louisiana Territory under a Territorial organization until slavery could have been eradicated in it. And it was probably, in {64} 1819, already too late to attempt to keep the remaining parts of this vast region, so far as it had been settled at all, under Territorial organization until this result could have been effected. At least, the advocates of freedom in 1819 evidently thought so, for they searched the Constitution to find some other power in the general Government by which to deal with the question. [Sidenote: The powers of Congress in the admission of new "States" into the Union.]