Thereupon this enactment ceased to have binding virtue in any sense, whether as respects the North or the South, and so in effect it was treated on the occasion of the admission of the State of California and the organization of the Territories of New Mexico, Utah, and Washington.

Such was the state of this question when the time arrived for the organization of the Territories of Kansas and Nebraska. In the progress of constitutional inquiry and reflection it had now at length come to be seen clearly that Congress does not possess constitutional power to impose restrictions of this character upon any present or future State of the Union. In a long series of decisions, on the fullest argument and after the most deliberate consideration, the Supreme Court of the United States had finally determined this point in every form under which the question could arise, whether as affecting public or private rights--in questions of the public domain, of religion, of navigation, and of servitude.

The several States of the Union are by force of the Constitution coequal in domestic legislative power. Congress can not change a law of domestic relation in the State of Maine; no more can it in the State of Missouri. Any statute which proposes to do this is a mere nullity; it takes away no right, it confers none. If it remains on the statute book unrepealed, it remains there only as a monument of error and a beacon of warning to the legislator and the statesman. To repeal it will be only to remove imperfection from the statutes, without affecting, either in the sense of permission, or of prohibition, the action of the States or of their citizens.

Still, when the nominal restriction of this nature, already a dead letter in law, was in terms repealed by the last Congress, in a clause of the act organizing the Territories of Kansas and Nebraska, that repeal was made the occasion of a widespread and dangerous agitation. It was alleged that the original enactment being a compact of perpetual moral obligation, its repeal constituted an odious breach of faith. An act of Congress, while it remains unrepealed, more especially if it be constitutionally valid in the judgment of those public functionaries whose duty it is to pronounce on that point, is undoubtedly binding on the conscience of each good citizen of the Republic. But in what sense can it be asserted that the enactment in question was invested with perpetuity and entitled to the respect of a solemn Compact? Between whom was the compact? No distinct contending powers of the Government, no separate sections of the Union treating as such, entered into treaty stipulations on the subject. It was a mere clause of an act of Congress, and, like any other controverted matter of legislation, received its final shape and was passed by compromise of the conflicting opinions or sentiments of the members of Congress. But if it had moral authority over men's consciences, to whom did this authority attach? Not to those of the North, who had repeatedly refused to confirm it by extension and who had zealously striven to establish other and incompatible regulations upon the subject. And if, as it thus appears, the supposed compact had no obligatory force as to the North, of course it could not have had any as to the South, for all such compacts must be mutual and of reciprocal obligation.

It has not unfrequently happened that lawgivers, with undue estimation of the value of the law they give or in the view of imparting to it peculiar strength, make it perpetual in terms; but they can not thus bind the conscience, the judgment, and the will of those who may succeed them, invested with similar responsibilities and clothed with equal authority. More careful investigation may prove the law to be unsound in principle. Experience may show it to be imperfect in detail and impracticable in execution. And then both reason and right combine not merely to justify but to require its repeal.

The Constitution, supreme, as it is, over all the departments of the Government--legislative, executive, and judicial--is open to amendment by its very terms; and Congress or the States may, in their discretion, propose amendment to it, solemn compact though it in truth is between the sovereign States of the Union. In the present instance a political enactment which had ceased to have legal power or authority of any kind was repealed. The position assumed that Congress had no moral right to enact such repeal was strange enough, and singularly so in view of the fact that the argument came from those who openly refused obedience to existing laws of the land, having the same popular designation and quality as compromise acts; nay, more, who unequivocally disregarded and condemned the most positive and obligatory injunctions of the Constitution itself, and sought by every means within their reach to deprive a portion of their fellow-citizens of the equal enjoyment of those rights and privileges guaranteed alike to all by the fundamental compact of our Union.

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.

Of course these imputations on the intentions of Congress in this respect, conceived, as they were, in prejudice and disseminated in passion, are utterly destitute of any justification in the nature of things and contrary to all the fundamental doctrines and principles of civil liberty and self-government.