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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 name for the compromise proposed by Henry Clay for the admission of Missouri to the United States was the Missouri Compromise. It said that Missouri would be admitted as â¦ a slave state and Maine as a free state.It kept the balance of power in the Senate between the slave states and free states.esulting from the Missouri Compromise was a division of territory west of that state being divided north & south between possible slave & free states. Also, to keep a balance of slave & free states in congress.