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The 1860 United States presidential election was the 19th quadrennial presidential election, held on November 6, 1860. In a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin, absent from the ballot in ten slave states, won a national popular plurality, a popular majority in the North where states already had abolished slavery, and a national electoral majority comprising only Northern electoral votes. Lincoln's election thus served as the main catalyst of the American Civil War. The United States had become increasingly sectionally divided during the 1850s, primarily over extending slavery into the Western territories. The incumbent president, James Buchanan, like his predecessor, Franklin Pierce, was a Northern Democrat with Southern sympathies. From the mid-1850s, the anti-slavery Republican Party became a major political force, driven by Northern voter opposition to the Kansas–Nebraska Act and the Supreme Court's 1857 decision in Dred Scott v. Sandford. From the election of 1856, the Republican Party had replaced the defunct Whig Party as the major opposition to the Democrats. A group of former Whigs and Know Nothings formed the Constitutional Union Party, which sought to avoid disunion by resolving divisions over slavery with some new compromise. The 1860 Republican National Convention in Chicago nominated Lincoln, a moderate former one-term Whig Representative from Illinois. Its platform promised not to interfere with slavery in the South but opposed extension of slavery into the territories. The 1860 Democratic National Convention adjourned in Charleston, South Carolina, without agreeing on a nominee, but a second convention in Baltimore, Maryland, nominated Illinois Senator Stephen A. Douglas. Douglas's support for the concept of popular sovereignty, which called for each territory's settlers to decide locally on the status of slavery, alienated many radical pro-slavery Southern Democrats, who wanted the territories, and perhaps other lands,
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