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1820
Was passed admitting Missouri as a slave state and Maine as a free state.

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1828
A protective tariff passed by the congress of the United States designed to protect industry in the Northern United States.

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1832-1833
It was a United States sectional political crisis which involved a confrontation between the state of South Carolina and the federal government over tariffs.

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1846-1848
Conflict between the United States and Mexico. It stemmed from the annexation of the Republic Texas by the U.S. and from a dispute over whether Texas ended at the Nueces River or the Rio Grande River.

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1846
Unsuccessful proposal in the United States congress to ban slavery in territory acquired from Mexico in the Mexican- American War.

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1850
Consists of five laws that dealt with the issue of slavery and territorial expansion.

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1852
An Anti-slavery novel by American author Harriet Beecher Stowe.

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1854
A territorial organic act that created the territories of Kansas and Nebraska.

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1854-1861
A series of violent confrontations in Kansas Territories and debate over the legality of slavery in the proposed state of Kansas.

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1857
A landmark decision of the US Supreme Court in which the court held that the US constitution was not meant to include black people, regardless whether they were free or enslaved.

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1859
Effort by abolitionist John Brown, to initiate a slave revolt in southern states by taking over the United States arsenal at Harpers Ferry, Virginia.

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1860
In a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin emerged triumphant.