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Date: 1820
The Missouri Compromise allowed Missouri to be a slave state, and for Maine to be a free state. It also banned any slavery in any states north of Missouri's border.

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Date: January 1, 1831
The Liberator was a newspaper run by William Lloyd Garrison, an abolitionist. It was an anti-slavery newspaper that didn't support people and acts that would prolong slavery.

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Date: August 21-23, 1831
The Nat Turner Revolt was a rebellion lead by a slave named Nathanial Turner. His revolt showed that slaves were unhappy with being slaves, and lead to laws that didn't allow the education, movement, or assembly of slaves.

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Date: April 1846-February 1848
The Mexican War started because of the annexation of Texas, as well as a dispute of whether Texas ended at the Neuces River or the Rio Grande. The US ended up winning and receiving the Texan territory.

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Date: September 1850
The Compromise of 1850 was a set of bills that settled a debate between free and slave states about the land that had been acquired from the Mexican War. The Fugitive Slave Act was amended, and slave trade in Washington D.C. stopped.

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Date: March 20, 1852
Uncle Tom's Cabin was an anti-slavery novel by Harriet Beecher Stowe. It was very popular among white people in the North for showing and dramatizing what it was like to be a slave.

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Date: March 20, 1854
The Republican party was formed to stop the expansion of slavery. It consisted of anti-slavery Whigs, Democrats, and reformers who wanted to keep slavery out of the territories.

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Date: May 30, 1854
The Kansas-Nebraska Act repealed the Missouri Compromise and created territories that allowed for popular sovereignty. This lead to a violent uprising as proslavery and antislavery activists tried to sway the vote.

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Date: May 22, 1856
The Brooks-Sumner Caning is when US Senator Preston Brooks repeatedly beat Senator Charles Sumner with a walking cane because he had given a speech criticizing slaveholders.

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Date: March 6, 1857
The Dred Scott decision was a decision made by the court that decided that a slave who lived in a free state was not entitled to his freedom. They also said that African Americans could never be United States citizens.

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Date: October 16-18, 1859
John Brown's Raid was an assault led by John Brown and armed abolitionists on Harper's Ferry. It was an attempt to start an armed revolt and destroy slavery.

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Date: November 6, 1860
The Election of 1860 was about slavery and states' rights, and left many people divided. In the end, Lincoln had won, due to earning more electoral votes than popular votes. This caused South Carolina to be the first state to secede from the Union.

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Date: December 20, 1860
South Carolina had seceded from the United States because Abraham Lincoln, a Republican, had became president. He was known to be anti-slavery, which South Carolina had seen as a threat, so they were the first state to secede.