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The force of events moved very quickly upon the election of Lincoln. South Carolina acted first, calling for a convention to secede from the Union. State by state, conventions were held, and the Confederacy was formed. Within three months of Lincoln's election, seven states had seceded from the Union.

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Abraham Lincoln is elected president of the US, prompting 11 states to secede from the Union.

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Abolitionist John Brown leads a small group on a raid against a federal armory in Harpers Ferry, Virginia, in an attempt to start an armed slave revolt and destroy the institution of slavery.

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A series of debates between Abraham Lincoln and 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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After Dred Scott, a slave, sues for his freedoms, the Supreme Court declares that blacks have no rights as citizens and that Congress cannot make laws concerning slavery in the territories.

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Legislative violence broadly refers to any violent clashes between members of a legislature, often physically, inside the legislature and triggered by divisive issues and tight votes.

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Northerners and Southerners flooded into Kansas to either oppose or support slavery. The two groups end up fighting it out in Kansas territory.

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This acts opens up the Great Plains to settlement and nullifies the Missouri Compromise by allowing the territory to choose whether to allow slavery. Eventually, it results in violence throughout Kansas as antislavery and pro-slavery settlers battle for control of the territory

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Northerners and Southerners felt as if the Fugitive Slave Act wasn't right. Northerners refused to support the act while Southerners believed it wasn't enforced enough.

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When California applies for statehood as a free state, some Southerners threaten to secede. Congress resolves the crisis by redefining where slavery is permitted in the territories and enacting a stronger fugitive slave law.

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After extending the line between free and slave states to the Pacific, in 1849, California tried to apply to be apart of the Union. This was denied by slave states and said it would unbalance the number between slave state and free state representatives. This made the dispute about slavery even more tense.

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David Wilmot tried to pass the Wilmot Proviso which would prohibit slavery in the territory acquired from the war with Mexico. The Wilmot passed in the House of Representatives but rejected by the Senate.

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Slaves who flee or attempt to flee slavery and escape to the North

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As the Second Great Awakening came about, people of the religious revival believed it was God's plane to abolition of slavery. This unraveled the Missouri Compromise by causing abolitionists to flood Congress with anti-slavery petition

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An agreement made by Congress in 1820 under which Missouri was admitted to the Union as a slave state and Maine was admitted as a free state. It also created an imaginary line in which any future state north of this line will be a free state and any state under this line would be a slave state.