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In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missourias a slave state and Maine as a free state

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A run away slave

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With the election in 1860 of Abraham Lincoln, who ran on a message of containing slavery to where it currently existed, and the success of the Republican Party to which he belonged – the first entirely regional party in US history – in that election, South Carolinaseceded on December 20, 1860, the first state to ever ...

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On November 6, 1860, Lincoln was elected the 16th president of the United States, beating Douglas, Breckinridge, and Bell. He was the first president from the Republican Party.

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Lincoln-Douglas debates definition. A series of debates between Abraham Lincolnand Stephen A. Douglas in 1858, when both were campaigning for election to the United States Senate from Illinois. Much of the debating concerned slavery and its extension into territories such as Kansas.

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Sandford, legal case in which the U.S. Supreme Court on March 6, 1857, ruled (7–2) that a slave (Dred Scott) who had resided in a free state and territory (where slavery was prohibited) was not thereby entitled to his freedom; that African Americans were not and could never be citizens of the United States;

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Bleeding Kansas. Bleeding Kansas, Bloody Kansas or the Border War was a series of violent confrontations in the United States between 1854 and 1861 which emerged from a political and ideological debate over the legality of slavery in the proposed state of Kansas.

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Kansas-nebraska Act. The Kansas-Nebraska Act of 1854 allowed citizens in theKansas and Nebraska territories to decide locally whether to allow slavery. The actwas modeled on the Compromise of 1850 but repealed both that compromise and the Missouri Compromise of 1820.

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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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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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In 1849, Californians sought statehood and, after heated debate in the U.S. Congress arising out of the slavery issue,California entered the Union as a free, nonslavery state by the Compromise of 1850. California became the 31st state on September 9, 1850.

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In 1854, the Missouri Compromise of 1820 was superseded by the Kansas–Nebraska Act, which allowed white male settlers in the new territories to determine through popular sovereignty whether they would allow slavery within each territory.

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Southerners worried that if Congress banned slavery in Missouri, it would try to end slavery elsewhere. The Compromise resolved the issue by admitting Missouri as a slave state and Maine as a free state.