What two states were admitted to the union as part of the missouri compromise

Maine and Missouri were admitted as a result of the Missouri Compromise of 1820.

Explanation:

Missouri had applied for admittance, but they were a slave territory and their admittance would have caused an imbalance in the proportions of slave states to free states. Because of this Maine, which had previously been a part of Massachusetts, was admitted as a free state. This was done to keep the balance between the free and slave states.

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