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In page Dred Scott v. Sandford:

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In 1820, the U.S. Congress passed legislation known as the "Missouri Compromise" that was intended to resolve the dispute. The Compromise first admitted Maine into the Union as a free state, then created Missouri out of a portion of the Louisiana Purchase territory and admitted it as a slave state; it also prohibited slavery in the area north of the parallel 36°30′ north, where most of the territory lay.[1] The legal effects of a slaveowner taking his slaves from Missouri into the free territory north of latitude 36°30′ north, as well as the constitutionality of the Missouri Compromise itself, eventually came to a head in the Dred Scott case.[citation needed]