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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 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.It also est â¦ ablished the 36-30 line, and  said that slavery would not be allowed above that line except for  in Missouri.he Missouri Compromise was put forth by Senator Henry Clay in an attempt to prevent the addition of the new territory of Missouri, as a slave slate, from tipping the balance â¦ of power in Congress to Southern States.