This argument against the repeal of the statute line in question was accompanied by another of congenial character and equally with the former destitute of foundation in reason and truth.  It was imputed that the measure originated in the conception of extending the limits of slave labor beyond those previously assigned to it, and that such was its natural as well as intended effect; and these baseless assumptions were made, in the Northern States, the ground of unceasing assault upon constitutional right.

The repeal in terms of a statute, which was already obsolete and also null for unconstitutionality, could have no influence to obstruct or to promote the propagation of conflicting views of political or social institution.  When the act organizing the Territories of Kansas and Nebraska was passed, the inherent effect upon that portion of the public domain thus opened to legal settlement was to admit settlers from all the States of the Union alike, each with his convictions of public policy and private interest, there to found, in their discretion, subject to such limitations as the Constitution and acts of Congress might prescribe, new States, hereafter to be admitted into the Union.  It was a free field, open alike to all, whether the statute line of assumed restriction were repealed or not.  That repeal did not open to free competition of the diverse opinions and domestic institutions a field which without such repeal would have been closed against them; it found that field of competition already opened, in fact and in law.  All the repeal did was to relieve the statute book of an objectionable enactment, unconstitutional in effect and injurious in terms to a large portion of the States.

Is it the fact that in all the unsettled regions of the United States, if emigration be left free to act in this respect for itself, without legal prohibitions on either side, slave labor will spontaneously go everywhere in preference to free labor?  Is it the fact that the peculiar domestic institutions of the Southern States possess relatively so much of vigor that wheresoever an avenue is freely opened to all the world they will penetrate to the exclusion of those of the Northern States?  Is it the fact that the former enjoy, compared with the latter, such irresistibly superior vitality, independent of climate, soil, and all other accidental circumstances, as to be able to produce the supposed result in spite of the assumed moral and natural obstacles to its accomplishment and of the more numerous population of the Northern States?

The argument of those who advocate the enactment of new laws of restriction and condemn the repeal of old ones in effect avers that their particular views of government have no self-extending or self-sustaining power of their own, and will go nowhere unless forced by act of Congress.  And if Congress do but pause for a moment in the policy of stern coercion; if it venture to try the experiment of leaving men to judge for themselves what institutions will best suit them; if it be not strained up to perpetual legislative exertion on this point—­if Congress proceed thus to act in the very spirit of liberty, it is at once charged with aiming to extend slave labor into all the new Territories of the United States.