The 1856 United States presidential election was the 18th quadrennial presidential election, held on Tuesday, November 4, 1856. In a three-way election, Democrat James Buchanan defeated Republican nominee John C. Frémont and Know Nothing nominee Millard Fillmore. The main issue was the expansion of slavery as facilitated by the Kansas–Nebraska Act of 1854. Buchanan defeated President Franklin Pierce at the 1856 Democratic National Convention for the nomination. Pierce had become widely unpopular in the North because of his support for the pro-slavery faction in the ongoing civil war in territorial Kansas, and Buchanan, a former Secretary of State, had avoided the divisive debates over the Kansas–Nebraska Act by being in Europe as the Ambassador to the United Kingdom.

James Buchanan Jr. was an American lawyer, diplomat, and politician. He served as the 15th president of the United States from 1857 to 1861, as the secretary of State from 1845 to 1849, and represented Pennsylvania in both houses of the U.S. Congress. He was an advocate for states' rights, particularly regarding slavery, and minimized the role of the federal government preceding the Civil War.