The Missouri Compromise of 1820:

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The Missouri Compromise of 1820 was an agreement between the Northern and Southern states of the United States that sought to maintain an overall balance between the number of free states and slave states. It allowed Maine to enter the Union as a free state and Missouri as a slave state, and prohibited slavery in any new states formed north of the 36°30′ parallel except for Missouri. This compromise was an attempt to resolve the growing tensions between the slave-holding South and the abolitionist North, but ultimately failed to prevent the outbreak of the Civil War.