| On This Day in American History |
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On March 15, 1820, Maine enters the Union as the 23rd state. Maine had been administered as a province of Massachusetts since 1647. Statehood was a part of the Missouri Compromise of 1820, which required states to be admitted in pairs, one free and one with slavery, to preserve congressional balance. Maine was a free state, and Missouri, when it became a state in 1821, allowed slavery. Today, Maine is the least densely populated state east of the Mississippi River.
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