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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 settled the question of slavery in the United States for many years. Its repeal would bring about conflict that would lead to the Civil War. Compromise . Highlights. Missouri applied for statehood on December 18, 1818. This created a problem because the Northern states refused to allow another slave state to join the Union. In 1819, Maine applied for statehood. Then a compromise developed: Maine could join as a free state to balance out Missouri joining as a slave state. By 1820, the compromise had been realized. First, Missouri and Maine would be admitted to the Union, one as slave and one as free. In addition, the remaining territories would be divided into free and slave at the 36Â°30' parallel. This compromise became viewed as sacred by both sides.