Missouri Compromise

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Missouri Compromise Soundex Code M260

Wikipedia page about the Missouri Compromise

The Missouri Compromise was a federal statute in the United States that regulated slavery in the country's western territories. The compromise, devised by Henry Clay, was agreed to by the pro-slavery and anti-slavery factions in the Congress and passed as a law in 1820. It prohibited slavery in the former Louisiana Territory north of the parallel 36°30′ north, except within the boundaries of the proposed state of Missouri. The passage of the Missouri Compromise took place during the presidency of James Monroe.

The Missouri Compromise was effectively repealed by the Kansas–Nebraska Act, submitted to Congress by Stephen A. Douglas in January 1854. The Act opened Kansas Territory and Nebraska Territory to slavery and future admission of slave states by allowing white male settlers in those territories to determine through "popular sovereignty" whether they would allow slavery within each territory. Thus, the Kansas–Nebraska Act effectively undermined the prohibition on slavery in territory north of 36°30′ latitude which had been established by the Missouri Compromise. This change was viewed by Free Soilers and many abolitionist Northerners as an aggressive, expansionist maneuver by the slave-owning South, and led to the creation of the Republican Party.

Although already superseded by the Kansas–Nebraska Act, the United States Supreme Court indicated that the Missouri Compromise was unconstitutional.