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The Missouri Compromise of 1820 was important because it played a significant role in the relationship between the North and the South. It resulted in the admission of Missouri to the Union as a slave state.he Missouri Compromise of 1820 admitted Missouri as a slave state,  and Maine as a free state, to keep the balance of slave/non-slave  states equal in Congress.
The Missouri Compromise passed Congress in 1820. It admitted Missouri to the Union as a slave state and barred slavery from the Louisiana Territory north of the 36Â°30' parallel.he Missouri Compromise was passed by Congress in 1820 in response to the large increase in U.S. territory as a result of the Louisiana Purchase. It provided that for every new free state that was added to the union, a slave state should be added.