"That, as an express and fundamental condition to the acquisition of any territory from the Republic of Mexico by the United States, neither slavery nor involuntary servitude shall ever exist in any part of said territory."

Wilmot Proviso, August 8, 1846.

From the campaign of 1844 to the Civil War the slavery question dominated all others in politics, North and South. During this period almost every legislative question was decided with reference to its effect on slavery. Press, Pulpit and Platform felt the baleful influence of its presence, and aspirants to the presidency and to lesser political honors sacrificed principle, conscience, and the support of their friends to obtain the favor of the aggressive and dominating Slave Power. The Democratic Party during this entire period took a bold stand on the question; an anti-slavery wing of the party appeared in the North, but at no time was it successful in changing the party platforms. The Whig Party, with its strong pro-slavery wing in the South, and with its northern members desirous of party success, omitted entirely any mention of slavery in its platforms, and although the anti-slavery members of the party were outspoken in their private views of slavery, they attended the party conventions and acquiesced in the platforms until 1852, when there was a general desertion of the Whig platform and candidate. The refusal of the Whig Party to make a direct issue of the slavery question doomed it, sooner or later, to dissolution; and although the party was successful in 1840 and in 1848, its disintegration really began after the election of 1840.

To say that the result of the "Log Cabin and Hard Cider" campaign was a bitter disappointment to both Democrats and Whigs is putting it mildly. The Democrats were deeply chagrined at the defeat of their candidate by a "clap-trap" campaign, and the disappointment of the Whigs came with the death of President Harrison and the succession of Tyler, who played directly into the hands of the Democrats and the Slave Power, bitterly antagonizing the party that elected him.

The Texas question now came up to disturb politics and again bring slavery directly before the people. Texas had gained her independence from Mexico, and had applied, in 1837, to be received into the Union, but the offer was declined by President Van Buren. The tragic death of Mr. Upshur, Secretary of State, on February 28, 1844, and the appointment of Mr. Calhoun to that office, made possible the completion of a long conspiracy to admit Texas, and to further extend the slave area by a war with Mexico. A Treaty of Annexation was immediately prepared (April 12, 1844) and presented to the Senate, but was subsequently rejected. It then became apparent that the South intended to make a political issue of the Texas question, and there was great alarm in the North, for the admission of Texas meant a slave area capable of being divided into five or six slave States. In addition, it meant war with Mexico over disputed boundaries, and the fact that Mexico had not fully recognized the independence of Texas, and the result of that war would unquestionably be the acquisition of more area contiguous to the South.

Mr. Clay and Mr. Van Buren at this time were the only ones prominently mentioned as possibilities for the Whig and Democratic nominations for the presidency; both published letters in which they opposed the annexation of Texas. Mr. Van Buren's letter cost him the Democratic nomination, for when the Convention met at Baltimore on May 27, 1844, he was unable to obtain a sufficient vote under the two-thirds rule, and the South forced the nomination of James K. Polk of Tennessee. This division on the slavery question in a Democratic Convention is of great historical importance as a link in the chain of events which led to the final great political division between the North and South. The Democratic Platform was emphatic in its support of slavery and the condemnation of the Abolitionists; it advocated the annexation of Texas and the occupation of Oregon, and the Democrats went into the campaign with the rallying cry of "Fifty-Four Forty or Fight," in the North—a promise of more free soil—and in the South the "Annexation of Texas."

Mr. Clay's letter had made him stronger than ever with his party and he was nominated unanimously. The Whig Platform, however, was absolutely silent about the Texas question, and there was absolutely no mention of any opposition to slavery; the whole question was totally ignored. Mr. Clay would have defeated Polk had he not been led into the blunder of writing another letter on the Texas question, in which he largely withdrew from his earlier position; this alienated great numbers of the Northern Whigs and threw thousands of votes to the candidate of the Liberty Party. This party, in a convention at Buffalo the preceding year, had again nominated James G. Birney for President. Its platform was long and elaborate, and contained strong denunciations of slavery and pledged the party to work for its abolition. The Liberty Party polled a total of 62,300 votes, defeating Clay, who lost New York, the pivotal State, with its thirty-six electoral votes, by 5,106, the Liberty Party casting 15,812 votes in that State. Texas annexation followed the election, but the pledge in regard to Oregon was cast aside. "Fifty-four Forty or Fight" was nothing more than a campaign cry, never intended to be followed up, and, in truth, could not have been without a war with England.

With the great Texas victory achieved, the South now turned herself to the acquisition of more territory, and war with Mexico was declared May 11, 1846. The Whig Party in the North was strongly against the Mexican War, and a strong element also expressed itself in the northern Democratic ranks as against it; the opposition became so threatening that, as a new House was to be elected in the Fall of 1846, the Administration decided to end the War, if possible, and Congress was asked to give $2,000,000 to be used in negotiating a Treaty with Mexico, fixing the disputed boundaries. Immediately David Wilmot, of Pennsylvania, introduced a Proviso, which had been prepared by Jacob Brinkerhoff, of Ohio (both Democrats, and both afterwards members of the Republican Party), to the effect that slavery should be prohibited in any territory acquired from Mexico. This Proviso carried in the House, but the Senate adjourned its session without coming to a vote on it. The Proviso appeared again often in Congress, but was never adopted; it caused more excited debate between the North and South than anything that had ever been introduced by the anti-slavery element in Congress. Although defeated, it served to amalgamate the anti-slavery forces, and from that day they rallied around it as representing the fixed and unalterable sentiment of the North; on it the Free-Soil Party entered the Campaign of 1848 and it was the underlying principle in the organization of the Republican Party in 1854. As a counter-balancing action to the Wilmot Proviso, Mr. Calhoun, in February, 1847, introduced in the Senate a long resolution to the effect that Congress had no power to prohibit slavery in any territory, and that any attempt to do so would be a violation of constitutional rights and lead to a dissolution of the Union. No vote was ever taken on this resolution, and it was nothing more than a deliberate attempt to force the issue with the North.

The Thirtieth Congress met December 6, 1847, and had among its members Abraham Lincoln, of Illinois, and Andrew Johnson, of Tennessee, the former elected as a Whig and the latter as a Democrat; in the Senate Stephen A. Douglas, of Illinois, took his seat for the first time in that body. Opposition to the war was strong, and it was finally closed by the Treaty of Guadalupe Hidalgo, signed February 2, 1848; by its terms vast stretches of new territory were acquired by the United States. This land had been free soil by the Laws of Mexico since 1827, but the South, as a matter of course, expected, and had planned, to make it slave soil, and she was determined to oppose to the utmost any attempt to keep slavery out of this new territory; the North was equally determined that it should remain free. The campaign of 1848 came on with the question undecided. The Democratic Convention nominated Lewis Cass, of Michigan, and adopted a platform similar to those of 1840 and 1844, but nothing was said about slavery in the new territory. The Whigs nominated Major-General Zachary Taylor, of Louisiana, for President, and Millard Fillmore, of New York, for Vice-President, and their Convention adjourned without adopting any platform at all.

The failure of the two great parties to take up the prohibition of slavery in the new territory was regarded with great indignation by many members of both parties in the North, especially so by the Whigs; in addition, an element of political revenge crept into the situation to help the anti-slavery sentiment. The defeat of Van Buren in the Democratic Convention of '44, and the anti-slavery sentiment in the Democratic Party, had divided it, in New York, into two factions known as "Barnburners" and "Hunkers"; the former being those who were opposed to the extension of the slave area, and were likened to the Dutchman who burned his barn to rid it of rats; and the latter were "Administration Democrats"—"Northern men with Southern principles," who "hankered" after office. Samuel J. Tilden and Benjamin F. Butler were two of the leading "Barnburner" leaders. When the Democratic National Convention convened in 1848, both "Barnburners" and "Hunkers" applied for admission; the Convention offered to permit the New York vote to be cast between them. This was refused by the "Barnburners," and they withdrew and held an enthusiastic meeting in New York, and soon became known as "Free-Soil Democrats." A National Convention was called to meet at Buffalo, August 9, 1848. The old Liberty Party had already held their Convention in November, 1847, and had nominated John P. Hale, of New Hampshire, for President, but Mr. Hale withdrew and the Liberty Party joined in the new movement and attended the Free-Soil Convention. Mr. Van Buren was nominated for President, and Charles Francis Adams, of Massachusetts, for Vice-President. The Free-Soil Platform was, of course, strongly antagonistic to the Slave Power, and concluded with the stirring words, "We inscribe on our banner, 'Free Soil, Free Speech, Free Labor and Free Men,' and under it will fight on and fight ever, until a triumphant victory shall reward our exertions."