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a person who favors formal withdrawal from membership of a federation or body, especially a political state.

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The Cooperationists were a group formed in the United States in the 1860s. The group was formed after the Election of 1860.

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The Unionist Party, later re-named Unconditional Unionist Party, was a political party started after Compromise of 1850 to define politicians who supported the Compromise.

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The Declaration of the Immediate Causes Which Induce and Justify the Secession of South Carolina from the Federal Union was a proclamation issued on December 24, 1860, by the government of South Carolina to explain its reasons for seceding from the United States (Full text of the declaration).

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The United States Presidential Election of 1860 was the nineteenth quadrennial presidential election to select the President and Vice President of the United States. The election was held on Tuesday, November 6, 1860.

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John Brown's raid on Harper's Ferry was an effort by armed abolitionist John Brown to initiate an armed slave revolt in 1859 by taking over a United States arsenal at Harpers Ferry, West Virginia.

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John Brown was an American abolitionist who believed in and advocated armed insurrection as the only way to overthrow the institution of slavery in the United States.

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Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865.

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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 and their two daughters in the Dred Scott v. Sandford case of 1857, popularly known as the "Dred Scott Decision".

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The Free Soil Party was a short-lived political party in the United States active in the 1848 and 1852 presidential elections as well as in some state elections.

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Bleeding Kansas, Bloody Kansas or the Border War was a series of violent political confrontations in the United States between 1854 and 1861 involving anti-slavery "Free-Staters" and pro-slavery "Border Ruffian", or "southern" elements in Kansas.

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The Fugitive Slave Law or Fugitive Slave Act was passed by the United States Congress on September 18, 1850, as part of the Compromise of 1850 between Southern slave-holding interests and Northern Free-Soilers. ... Abolitionists nicknamed it the "BloodhoundLaw" for the dogs that were used to track down runaway slaves.

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The Kansas–Nebraska Act of 1854 created the territories of Kansas and Nebraska and was drafted by Democratic Senator Stephen A. Douglas of Illinois and President Franklin Pierce.

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Senator Henry Clay introduced a series of resolutions on January 29, 1850, in an attempt to seek acompromise 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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The Mexican–American War, also known as the Mexican War and in Mexico the American intervention in Mexico, was an armed conflict between the United States of America and the United Mexican States from 1846 to 1848.

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Andrew Jackson was an American soldier and statesman who served as the seventh President of the United States from 1829 to 1837.

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The United States Force Bill, formally titled "An Act further to provide for the collection of duties on imports", 4 Stat. 632 (1833), refers to legislation enacted by the 22nd U.S. Congress on March 2, 1833, during the Nullification Crisis.

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John Caldwell Calhoun was an American statesman and political theorist from South Carolina, and the seventh Vice President of the United States from 1825 to 1832.

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Protective tariffs are tariffs that are enacted with the aim of protecting a domestic industry. Tariffs are also imposed in order to raise government revenue, or to reduce an undesirable activity (sin tax)

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The Nullification Crisis was a United States sectional political crisis in 1832-33, during the presidency of Andrew Jackson, which involved a confrontation between South Carolina and the federal government.

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The Missouri Compromise is the title generally attached to the legislation passed by the 16th United States Congress on May 8, 1820.