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Southern states left the Union and became the Confederate States of America. The civil war soon followed.

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President Lincoln's win in the election was a threat to slave owners everywhere.

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These were debates in the race for U.S. senator and slavery was the dividing topic.

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This decision was a blow to abolitionists as it said African Americans were not citizens of the U.S.

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As emotions grew, Senator Charles Sumner was attacked on the senate floor.

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As new settlers rushed to find their place in Kansas, the slavery debate grew even more violent.

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This  act ended the Missouri Compromise. It allowed new territories to decide if they will become slave states or not.

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This act made it more difficult for slaves to run away. In addition, anyone helping to hide the slaves could be jailed.

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This compromise admitted California as free state. This also allowed New Mexico and Utah to decide for themselves. A stronger fugitive slave law was also put into action.

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When slaves ran away from their southern owners, they were called fugitives. They were often helped by sympathetic northerners, which infuriated slave owners.

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In the 1830's, there was a "Great Awakening" and support for the end of slavery. Congress initiated a "Gag rule" that allowed them to not discuss slavery issues.

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The Missouri Compromise of 1820 allowed Missouri to be admitted as a slave state and Maine as a free state. In addition, slavery would not be allowed north of Missouri.