USA HISTORY

Detailed explanation-1: -This legislation admitted Missouri as a slave state and Maine as a non-slave state at the same time, so as not to upset the balance between slave and free states in the nation.

Detailed explanation-2: -Enacted in 1820 to maintain the balance of power in Congress, the Missouri Compromise admitted Missouri as a slave state and Maine as a free state.

Detailed explanation-3: -Congress established Maine as the 23rd state under the Missouri Compromise of 1820. This arrangement allowed Maine to join the Union as a free state, with Missouri entering a year later as a slave state, thereby preserving the numerical balance between free and slave states in the nation.