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.