The two states that were admitted to the union as a part o the Missouri compromise were Maine and Missouri.
Explanation:
The Missouri compromise was a legislation of the United States at a Federal level that sought to bring balance to the force of its structure. It assigned one to the north and one to the south. According to its legislation slavery was prohibited from 36° 30' parallel, so it lets add Maine as a free state while Missouri was added as a slave state. The legislation passed on March 3, 1820, and former president Monroe signed it 3 days later.
