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 In the present instance a political enactment which had ceased to have legal power or authority of any kind was repealed.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 It was a free field, open alike to all, whether the statute line of assumed restriction were repealed or not.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.