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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 three most important compromises that pertain to slavery and territory are: the Missouri Compromise, the Compromiâ¦se of 1850, and the Kansas-Nebraska Act. The Missouri Compromise of 1820 admitted Missouri into the union as a slave state and admitted Maine as a free one. It is also stated that any land in the Lousiana Purchase, south of the latitude 36 degrees thirty was open to slavery; and slavery was prohibited in any territory north of the specified latitude.