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The Missouri Compromise was United States federal legislation that admitted Maine to the United States as a free state, simultaneously with Missouri as a slave state—thus maintaining the balance of power between North and South in the United States Senate.
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The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the Intervención Estadounidense en México, was an armed conflict between the United States and Mexico from 1846 to 1848
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The Compromise of 1850 was a package of five separate bills passed by the United States Congress in September 1850 that defused a political confrontation between slave and free states on the status of territories acquired in the Mexican–American War.
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The Kansas-Nebraska Act was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders. The Act served to repeal the Missouri Compromise of 1820 which prohibited slavery north of latitude 36°30´.
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The Dred Scott decision was the Supreme Court's ruling on March 6, 1857, that having lived in a free state and territory did not entitle a slave, Dred Scott, to his freedom. In essence, the decision argued that as a slave Scott was not a citizen and could not sue in a federal court. -
John Brown's raid on Harpers Ferry was an 1859 effort by abolitionist John Brown to initiate an armed slave revolt in Southern states by taking over a United States arsenal at Harpers Ferry, Virginia. It has been called the dress rehearsal for the Civil War.