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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.  So the Compromise set a bunch of rules about slavery, but the big  thing it did was it separated Maine from Massachusetts and allowed  it to become a free state. Missouri was allowed to become a slave  state.