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Because the residents were allowed to vote for or against slavery in Kansas (popular sovereignty), both pro-and-anti-slavery forces crossed the border to influence the election. Both sides made threats, destroyed property, and committed murder, Between 60 and 200 people were killed.

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A law that required people in the North and South to return escaped slaves to their owners. It led many free African Americans in the North being illegally kidnapped and sold into slavery in the South.

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Escaped slave who later helped hundreds escape slavery via the underground railroad. She later became a spy for the union army.

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This admitted California as a free state, created Utah and New Mexico territories with slavery to be determined by popular sovereignty (people allowed to vote on the issue directly), and ended the slave trade in Washington DC

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Missouri was admitted as a slave state. Maine was admitted as a free state. Slavery was prohibited in the area North of 36 degrees 30' latitude line. This compromise kept the balance of power intact.

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the division of the nation by sectional interests instead of the interests of the entire country

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a network of secret routes and safe houses established to help escaped slaves find freedom