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The Wilmot Proviso was issued on August 8th, 1846 by Pennsylvania Democratic Congressman David Wilmot. It prohibited the expansion of slavery into any territory acquired by the United States from Mexico as a result of the Mexican-American War settlement.

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popular sovereignty is a principle to the United States Constitution. The idea of people being able to vote and have a voice in their government is a significant element to the United States Constitution, forming a critical component of American government.

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The Underground Railroad was a network of secret routes and safe houses established in the United States during the early to mid-19th century, and used by enslaved African Americans to escape into free states and Canada. The scheme was assisted by abolitionists and others sympathetic to the cause of the escapees. Not literally but metaphorically a railroad, the enslaved who risked escape and those who aided them are also collectively referred to as the "Underground Railroad".

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Senator Henry Clay introduced a series of resolutions on January 29, 1850, in an attempt to seek a compromise and avert a crisis between North and South. As part of the Compromise of 1850, the Fugitive Slave Act was amended and the slave trade in Washington, D.C., was abolished.

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Passed on September 18, 1850 by Congress, The Fugitive Slave Act of 1850 was part of the Compromise of 1850. The act required that slavesbe returned to their owners, even if they were in a free state. The act also made the federal government responsible for finding, returning, and trying escaped slaves.

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The Kansas-Nebraska Act was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders. The Act served to repeal the Missouri Compromise of 1820 which prohibited slavery north of latitude 36°30´.

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Bleeding Kansas, Bloody Kansas, or the Border War was a series of violent civil confrontations in Kansas Territory, United States, between 1854 and 1859 which emerged from a political and ideological debate over the legality of slavery in the proposed state of Kansas.

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Dred Scott was an enslaved African-American man in the United States who unsuccessfully sued for his freedom and that of his wife, Harriet Robinson Scott, and their two daughters in the Dred Scott v. Sandford case of 1857, popularly known as the "Dred Scott case".

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The Lincoln–Douglas debates were a series of seven debates between Abraham Lincoln, the Republican Party candidate for the United States Senate from Illinois, and incumbent Senator Stephen Douglas, the Democratic Party candidate.

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John Brown's raid on Harpers Ferry was an effort by abolitionist John Brown, from October 16 to 18, 1859, to initiate a slave revolt in Southern states by taking over the United States arsenal at Harpers Ferry, Virginia. It has been called the dress rehearsal for or Tragic Prelude to the Civil War.

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The 1860 United States presidential election was the 19th quadrennial presidential election. It was held on Tuesday, November 6, 1860. In a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin emerged triumphant.

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The Battle of Fort Sumter was the bombardment of Fort Sumter near Charleston, South Carolina by the South Carolina militia, and the return gunfire and subsequent surrender by the United States Army, that started the American Civil War.