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John Brown's Raid was a raid on the arsenal in Harpers Ferry in the attempt to start a slave rebellion.

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Watch John Brown's Raid Clip | HISTORY Channel

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Although poorly planned and executed, John Brown's raid helped lead the nation into Civil War and made him one of the most controversial men of his day.

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The Lincoln-Douglas Debates were a series of debates between Abraham Lincoln and Stephen Douglas for the spot in the U.S. Senate.

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Sound Smart: The Lincoln-Douglass Debates | History

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A slave named Dred Scott tried to sue for his freedom based on the fact that he had lived on free soil for a time.

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The Dred Scott Decision: Crash Course Black American History #16

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Senator Charles Sumner personally insulted a pro-slavery senator, Andrew Pickens Butler, and a relative of his, Preston Brooks, beat Sumner with a can for it.

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Abolitionist John Brown and his men killed 5 pro-slavery men in Kansas along the Pottawatomie Creek.

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In the Sack of Lawrence about 800 pro-slavery men went to Lawrence and tried to arrest antislavery leaders, but they already fled. Because they couldn't arrest the antislavery leaders, they set fire to and looted the town.

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The Kansas-Nebraska Act made the rest of the Louisiana Purchase into Kansas and Nebraska and let the citizens decide on slavery in their states.

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In the Election of 1852, Democratic candidate, Franklin Pierce, won the election. He strongly supported the Compromise of 1850 and the Fugitive Slave Act.

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Antislavery Literature helped inform people about the horrors of being a slave.

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The Fugitive Slave Act made it legal for people to capture runaway slaves and return them to their owners.

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This compromise tried to bring peace between the North and the South but the South was upset about California becoming a free state.

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The Missouri Compromise further divided the slave states and the non-slave states by prohibiting slavery north of 36°30' latitude.

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The main cause of the Civil War was slavery. The South wanted slavery and the North didn't want slavery.