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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.   The Compromise of 1850 admitted California as a free state, and  gave the South stricter Fugitive Slave Laws as a way to balance  the deal.n 1820, the Missouri Compromise happened because of the desire of  Northern and Southern national leaders to maintain an even balance  between slavery-supporters and slaver â¦ y-opponents in America's  federal governing power.