 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, but at the same time prohibited slavery in the area north of the Parallel 36°30′ north, where most of the territory lay.The legal effects of a slaveowner taking his slaves from Missouri into the free territory north of the 36°30′ north parallel, as well as the constitutionality of the Missouri Compromise itself, eventually came to a head in the "Dred Scott" case.Dred Scott was born a slave in Virginia around 1799.