He used to say that, one way or another, he had voted forty-two times for the Wilmot Proviso, which Mr. Wilmot of Pennsylvania moved as an addition to every bill which affected United States territory, "that neither slavery nor involuntary servitude shall ever exist in any part of the said territory," and it is evident that his condemnation of the system, on moral grounds as a crime against the human race, and on political grounds as a cancer that was sapping the vitals of the nation, and must master its whole being or be itself extirpated, grew steadily upon him until it culminated in his great speeches in the Illinois debate.
By the mere election of Lincoln to the Presidency, the further extension of slavery into the Territories was rendered forever impossible--Vox populi, vox Dei. Revolutions never go backward, and when founded on a great moral sentiment stirring the heart of an indignant people their edicts are irresistible and final. Had the slave power acquiesced in that election, had the Southern States remained under the Constitution and within the Union, and relied upon their constitutional and legal rights, their favorite institution, immoral as it was, blighting and fatal as it was, might have endured for another century. The great party that had elected him, unalterably determined against its extension, was nevertheless pledged not to interfere with its continuance in the States where it already existed. Of course, when new regions were forever closed against it, from its very nature it must have begun to shrink and to dwindle; and probably gradual and compensated emancipation, which appealed very strongly to the new President's sense of justice and expediency, would, in the progress of time, by a reversion to the ideas of the founders of the Republic, have found a safe outlet for both masters and slaves. But whom the gods wish to destroy they first make mad, and when seven States, afterwards increased to eleven, openly seceded from the Union, when they declared and began the war upon the nation, and challenged its mighty power to the desperate and protracted struggle for its life, and for the maintenance of its authority as a nation over its territory, they gave to Lincoln and to freedom the sublime opportunity of history.
In his first inaugural address, when as yet not a drop of precious blood had been shed, while he held out to them the olive branch in one hand, in the other he presented the guarantees of the Constitution, and after reciting the emphatic resolution of the convention that nominated him, that the maintenance inviolate of the "rights of the States, and especially the right of each State to order and control its own domestic institutions according to its own judgment exclusively, is essential to that balance of power on which the perfection and endurance of our political fabric depend," he reiterated this sentiment, and declared, with no mental reservation, "that all the protection which, consistently with the Constitution and the laws, can be given, will be cheerfully given to all the States when lawfully demanded for whatever cause as cheerfully to one section as to another."
When, however, these magnanimous overtures for peace and reunion were rejected; when the seceding States defied the Constitution and every clause and principle of it; when they persisted in staying out of the Union from which they had seceded, and proceeded to carve out of its territory a new and hostile empire based on slavery; when they flew at the throat of the nation and plunged it into the bloodiest war of the nineteenth century the tables were turned, and the belief gradually came to the mind of the President that if the Rebellion was not soon subdued by force of arms, if the war must be fought out to the bitter end, then to reach that end the salvation of the nation itself might require the destruction of slavery wherever it existed; that if the war was to continue on one side for Disunion, for no other purpose than to preserve slavery, it must continue on the other side for the Union, to destroy slavery.