By the repeal of the Missouri Compromise, opening the Territories to the ingress of slavery, Douglas had pleased the South, but greatly alarmed the North. He had sought to conciliate Northern sentiment by appending to his Kansas-Nebraska Bill the declaration that its intent was "not to legislate slavery into any State or Territory, nor to exclude it therefrom, but to leave the people thereof perfectly free to form and regulate their institutions in their own way, subject only to the Constitution of the United States." This he called "the great principle of popular sovereignty." When asked whether, under this act, the people of a Territory, before its admission as a State, would have the right to exclude slavery, he answered, "That is a question for the courts to decide." Then came the famous "Dred Scott decision," in which the Supreme Court held substantially that the right to hold slaves as property existed in the Territories by virtue of the Federal Constitution, and that this right could not be denied by any act of a territorial government. This, of course, denied the right of the people of any Territory to exclude slavery while they were in a territorial condition, and it alarmed the Northern people still more. Douglas recognized the binding force of the decision of the Supreme Court, at the same time maintaining, most illogically, that his great principle of popular sovereignty remained in force nevertheless. Meanwhile, the proslavery people of western Missouri, the so-called "border ruffians," had invaded Kansas, set up a constitutional convention, made a constitution of an extreme pro-slavery type, the "Lecompton Constitution," refused to submit it fairly to a vote of the people of Kansas, and then referred it to Congress for acceptance,—seeking thus to accomplish the admission of Kansas as a slave State. Had Douglas supported such a scheme, he would have lost all foothold in the North. In the name of popular sovereignty he loudly declared his opposition to the acceptance of any constitution not sanctioned by a formal popular vote. He "did not care," he said, "whether slavery be voted up or down," but there must be a fair vote of the people. Thus he drew upon himself the hostility of the Buchanan administration, which was controlled by the proslavery interest, but he saved his Northern following. More than this, not only did his Democratic admirers now call him "the true champion of freedom," but even some Republicans of large influence, prominent among them Horace Greeley, sympathizing with Douglas in his fight against the Lecompton Constitution, and hoping to detach him permanently from the proslavery interest and to force a lasting breach in the Democratic party, seriously advised the Republicans of Illinois to give up their opposition to Douglas, and to help re-elect him to the Senate. Lincoln was not of that opinion. He believed that great popular movements can succeed only when guided by their faithful friends, and that the antislavery cause could not safely be entrusted to the keeping of one who "did not care whether slavery be voted up or down." This opinion prevailed in Illinois; but the influences within the Republican party over which it prevailed yielded only a reluctant acquiescence, if they acquiesced at all, after having materially strengthened Douglas's position. Such was the situation of things when the campaign of 1858 between Lincoln and Douglas began.

Lincoln opened the campaign on his side at the convention which nominated him as the Republican candidate for the senatorship, with a memorable saying which sounded like a shout from the watchtower of history: "A house divided against itself cannot stand. I believe this government cannot endure permanently half slave and half free. I do not expect the Union to be dissolved. I do not expect the house to fall, but I expect it will cease to be divided. It will become all one thing or all the other. Either the opponents of slavery will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction, or its advocates will push it forward, till it shall become alike lawful in all the States,—old as well as new, North as well as South." Then he proceeded to point out that the Nebraska doctrine combined with the Dred Scott decision worked in the direction of making the nation "all slave." Here was the "irrepressible conflict" spoken of by Seward a short time later, in a speech made famous mainly by that phrase. If there was any new discovery in it, the right of priority was Lincoln's. This utterance proved not only his statesmanlike conception of the issue, but also, in his situation as a candidate, the firmness of his moral courage. The friends to whom he had read the draught of this speech before he delivered it warned him anxiously that its delivery might be fatal to his success in the election. This was shrewd advice, in the ordinary sense. While a slaveholder could threaten disunion with impunity, the mere suggestion that the existence of slavery was incompatible with freedom in the Union would hazard the political chances of any public man in the North. But Lincoln was inflexible. "It is true," said he, "and I will deliver it as written.... I would rather be defeated with these expressions in my speech held up and discussed before the people than be victorious without them." The statesman was right in his far-seeing judgment and his conscientious statement of the truth, but the practical politicians were also right in their prediction of the immediate effect. Douglas instantly seized upon the declaration that a house divided against itself cannot stand as the main objective point of his attack, interpreting it as an incitement to a "relentless sectional war," and there is no doubt that the persistent reiteration of this charge served to frighten not a few timid souls.

Lincoln constantly endeavored to bring the moral and philosophical side of the subject to the foreground. "Slavery is wrong" was the keynote of all his speeches. To Douglas's glittering sophism that the right of the people of a Territory to have slavery or not, as they might desire, was in accordance with the principle of true popular sovereignty, he made the pointed answer: "Then true popular sovereignty, according to Senator Douglas, means that, when one man makes another man his slave, no third man shall be allowed to object." To Douglas's argument that the principle which demanded that the people of a Territory should be permitted to choose whether they would have slavery or not "originated when God made man, and placed good and evil before him, allowing him to choose upon his own responsibility," Lincoln solemnly replied: "No; God—did not place good and evil before man, telling him to make his choice. On the contrary, God did tell him there was one tree of the fruit of which he should not eat, upon pain of death." He did not, however, place himself on the most advanced ground taken by the radical anti-slavery men. He admitted that, under the Constitution, "the Southern people were entitled to a Congressional fugitive slave law," although he did not approve the fugitive slave law then existing. He declared also that, if slavery were kept out of the Territories during their territorial existence, as it should be, and if then the people of any Territory, having a fair chance and a clear field, should do such an extraordinary thing as to adopt a slave constitution, uninfluenced by the actual presence of the institution among them, he saw no alternative but to admit such a Territory into the Union. He declared further that, while he should be exceedingly glad to see slavery abolished in the District of Columbia, he would, as a member of Congress, with his present views, not endeavor to bring on that abolition except on condition that emancipation be gradual, that it be approved by the decision of a majority of voters in the District, and that compensation be made to unwilling owners. On every available occasion, he pronounced himself in favor of the deportation and colonization of the blacks, of course with their consent. He repeatedly disavowed any wish on his part to have social and political equality established between whites and blacks. On this point he summed up his views in a reply to Douglas's assertion that the Declaration of Independence, in speaking of all men as being created equal, did not include the negroes, saying: "I do not understand the Declaration of Independence to mean that all men were created equal in all respects. They are not equal in color. But I believe that it does mean to declare that all men are equal in some respects; they are equal in their right to life, liberty, and the pursuit of happiness."

With regard to some of these subjects Lincoln modified his position at a later period, and it has been suggested that he would have professed more advanced principles in his debates with Douglas, had he not feared thereby to lose votes. This view can hardly be sustained. Lincoln had the courage of his opinions, but he was not a radical. The man who risked his election by delivering, against the urgent protest of his friends, the speech about "the house divided against itself" would not have shrunk from the expression of more extreme views, had he really entertained them. It is only fair to assume that he said what at the time he really thought, and that if, subsequently, his opinions changed, it was owing to new conceptions of good policy and of duty brought forth by an entirely new set of circumstances and exigencies. It is characteristic that he continued to adhere to the impracticable colonization plan even after the Emancipation Proclamation had already been issued.

But in this contest Lincoln proved himself not only a debater, but also a political strategist of the first order. The "kind, amiable, and intelligent gentleman," as Douglas had been pleased to call him, was by no means as harmless as a dove. He possessed an uncommon share of that worldly shrewdness which not seldom goes with genuine simplicity of character; and the political experience gathered in the Legislature and in Congress, and in many election campaigns, added to his keen intuitions, had made him as far-sighted a judge of the probable effects of a public man's sayings or doings upon the popular mind, and as accurate a calculator in estimating political chances and forecasting results, as could be found among the party managers in Illinois. And now he perceived keenly the ugly dilemma in which Douglas found himself, between the Dred Scott decision, which declared the right to hold slaves to exist in the Territories by virtue of the Federal Constitution, and his "great principle of popular sovereignty," according to which the people of a Territory, if they saw fit, were to have the right to exclude slavery therefrom. Douglas was twisting and squirming to the best of his ability to avoid the admission that the two were incompatible. The question then presented itself if it would be good policy for Lincoln to force Douglas to a clear expression of his opinion as to whether, the Dred Scott decision notwithstanding, "the people of a Territory could in any lawful way exclude slavery from its limits prior to the formation of a State constitution." Lincoln foresaw and predicted what Douglas would answer: that slavery could not exist in a Territory unless the people desired it and gave it protection by territorial legislation. In an improvised caucus the policy of pressing the interrogatory on Douglas was discussed. Lincoln's friends unanimously advised against it, because the answer foreseen would sufficiently commend Douglas to the people of Illinois to insure his re-election to the Senate. But Lincoln persisted. "I am after larger game," said he. "If Douglas so answers, he can never be President, and the battle of 1860 is worth a hundred of this." The interrogatory was pressed upon Douglas, and Douglas did answer that, no matter what the decision of the Supreme Court might be on the abstract question, the people of a Territory had the lawful means to introduce or exclude slavery by territorial legislation friendly or unfriendly to the institution. Lincoln found it easy to show the absurdity of the proposition that, if slavery were admitted to exist of right in the Territories by virtue of the supreme law, the Federal Constitution, it could be kept out or expelled by an inferior law, one made by a territorial Legislature. Again the judgment of the politicians, having only the nearest object in view, proved correct: Douglas was reelected to the Senate. But Lincoln's judgment proved correct also: Douglas, by resorting to the expedient of his "unfriendly legislation doctrine," forfeited his last chance of becoming President of the United States. He might have hoped to win, by sufficient atonement, his pardon from the South for his opposition to the Lecompton Constitution; but that he taught the people of the Territories a trick by which they could defeat what the proslavery men considered a constitutional right, and that he called that trick lawful, this the slave power would never forgive. The breach between the Southern and the Northern Democracy was thenceforth irremediable and fatal.

The Presidential election of 1860 approached. The struggle in Kansas, and the debates in Congress which accompanied it, and which not unfrequently provoked violent outbursts, continually stirred the popular excitement. Within the Democratic party raged the war of factions. The national Democratic convention met at Charleston on the 23d of April, 1860. After a struggle of ten days between the adherents and the opponents of Douglas, during which the delegates from the cotton States had withdrawn, the convention adjourned without having nominated any candidates, to meet again in Baltimore on the 18th of June. There was no prospect, however, of reconciling the hostile elements. It appeared very probable that the Baltimore convention would nominate Douglas, while the seceding Southern Democrats would set up a candidate of their own, representing extreme proslavery principles.

Meanwhile, the national Republican convention assembled at Chicago on the 16th of May, full of enthusiasm and hope. The situation was easily understood. The Democrats would have the South. In order to succeed in the election, the Republicans had to win, in addition to the States carried by Fremont in 1856, those that were classed as "doubtful,"—New Jersey, Pennsylvania, and Indiana, or Illinois in the place of either New Jersey or Indiana. The most eminent Republican statesmen and leaders of the time thought of for the Presidency were Seward and Chase, both regarded as belonging to the more advanced order of antislavery men. Of the two, Seward had the largest following, mainly from New York, New England, and the Northwest. Cautious politicians doubted seriously whether Seward, to whom some phrases in his speeches had undeservedly given the reputation of a reckless radical, would be able to command the whole Republican vote in the doubtful States. Besides, during his long public career he had made enemies. It was evident that those who thought Seward's nomination too hazardous an experiment would consider Chase unavailable for the same reason. They would then look round for an "available" man; and among the "available" men Abraham Lincoln was easily discovered to stand foremost. His great debate with Douglas had given him a national reputation. The people of the East being eager to see the hero of so dramatic a contest, he had been induced to visit several Eastern cities, and had astonished and delighted large and distinguished audiences with speeches of singular power and originality. An address delivered by him in the Cooper Institute in New York, before an audience containing a large number of important persons, was then, and has ever since been, especially praised as one of the most logical and convincing political speeches ever made in this country. The people of the West had grown proud of him as a distinctively Western great man, and his popularity at home had some peculiar features which could be expected to exercise a potent charm. Nor was Lincoln's name as that of an available candidate left to the chance of accidental discovery. It is indeed not probable that he thought of himself as a Presidential possibility, during his contest with Douglas for the senatorship. As late as April, 1859, he had written to a friend who had approached him on the subject that he did not think himself fit for the Presidency. The Vice-Presidency was then the limit of his ambition. But some of his friends in Illinois took the matter seriously in hand, and Lincoln, after some hesitation, then formally authorized "the use of his name." The matter was managed with such energy and excellent judgment that, in the convention, he had not only the whole vote of Illinois to start with, but won votes on all sides without offending any rival. A large majority of the opponents of Seward went over to Abraham Lincoln, and gave him the nomination on the third ballot. As had been foreseen, Douglas was nominated by one wing of the Democratic party at Baltimore, while the extreme proslavery wing put Breckinridge into the field as its candidate. After a campaign conducted with the energy of genuine enthusiasm on the antislavery side the united Republicans defeated the divided Democrats, and Lincoln was elected President by a majority of fifty-seven votes in the electoral colleges.

The result of the election had hardly been declared when the disunion movement in the South, long threatened and carefully planned and prepared, broke out in the shape of open revolt, and nearly a month before Lincoln could be inaugurated as President of the United States seven Southern States had adopted ordinances of secession, formed an independent confederacy, framed a constitution for it, and elected Jefferson Davis its president, expecting the other slaveholding States soon to join them. On the 11th of February, 1861, Lincoln left Springfield for Washington; having, with characteristic simplicity, asked his law partner not to change the sign of the firm "Lincoln and Herndon" during the four years unavoidable absence of the senior partner, and having taken an affectionate and touching leave of his neighbors.

The situation which confronted the new President was appalling: the larger part of the South in open rebellion, the rest of the slaveholding States wavering preparing to follow; the revolt guided by determined, daring, and skillful leaders; the Southern people, apparently full of enthusiasm and military spirit, rushing to arms, some of the forts and arsenals already in their possession; the government of the Union, before the accession of the new President, in the hands of men some of whom actively sympathized with the revolt, while others were hampered by their traditional doctrines in dealing with it, and really gave it aid and comfort by their irresolute attitude; all the departments full of "Southern sympathizers" and honeycombed with disloyalty; the treasury empty, and the public credit at the lowest ebb; the arsenals ill supplied with arms, if not emptied by treacherous practices; the regular army of insignificant strength, dispersed over an immense surface, and deprived of some of its best officers by defection; the navy small and antiquated. But that was not all. The threat of disunion had so often been resorted to by the slave power in years gone by that most Northern people had ceased to believe in its seriousness. But, when disunion actually appeared as a stern reality, something like a chill swept through the whole Northern country. A cry for union and peace at any price rose on all sides. Democratic partisanship reiterated this cry with vociferous vehemence, and even many Republicans grew afraid of the victory they had just achieved at the ballot-box, and spoke of compromise. The country fairly resounded with the noise of "anticoercion meetings." Expressions of firm resolution from determined antislavery men were indeed not wanting, but they were for a while almost drowned by a bewildering confusion of discordant voices. Even this was not all. Potent influences in Europe, with an ill-concealed desire for the permanent disruption of the American Union, eagerly espoused the cause of the Southern seceders, and the two principal maritime powers of the Old World seemed only to be waiting for a favorable opportunity to lend them a helping hand.

This was the state of things to be mastered by "honest Abe Lincoln" when he took his seat in the Presidential chair,—"honest Abe Lincoln," who was so good-natured that he could not say "no"; the greatest achievement in whose life had been a debate on the slavery question; who had never been in any position of power; who was without the slightest experience of high executive duties, and who had only a speaking acquaintance with the men upon whose counsel and cooperation he was to depend. Nor was his accession to power under such circumstances greeted with general confidence even by the members of his party. While he had indeed won much popularity, many Republicans, especially among those who had advocated Seward's nomination for the Presidency, saw the simple "Illinois lawyer" take the reins of government with a feeling little short of dismay. The orators and journals of the opposition were ridiculing and lampooning him without measure. Many people actually wondered how such a man could dare to undertake a task which, as he himself had said to his neighbors in his parting speech, was "more difficult than that of Washington himself had been."