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It became a state as a result of the 1820 Missouri Compromise.
Missouri & Maine. APEX.
Missouri's application for statehood in 1819 raised the issue of whether slavery should be allowed in the new state, leading to fierce debates in Congress about the balance of power between free and slave states. The Missouri Compromise of 1820 emerged as a temporary resolution, allowing Missouri to enter the Union as a slave state while Maine entered as a free state, and prohibiting slavery in the unorganized territories north of the 36°30’ parallel.
The main purposes of both Missouri Compromises, 1820 & 1850 was to keep in balance free States & slave States. This would be handled before they became States. Or if necessary after Statehood.
It had to do with the Missouri Compromise, where both Missouri and Maine were applying for statehood. Maine was inducted as free, Missouri slave, and everything over the 36 30 line was free, except for Missouri. So who had to agree? The Senate and The House, so that they could get statehood. Without that, Maine would have been a state way later.
In 1820.
To achieve statehood, Missouri had to allow slavery. This was the Compromise of 1820. The other part of that compromise was that Maine entered the Union as a free state. To keep the number of slave states and free states equal, prevented the Civil War from happening sooner.
September 26, 1820 in Missouri.
March 15, 1820
The Missouri Compromise (1820)
Under the Missouri Compromise of 1820 Missouri was admitted as a slave state and Maine as a free state.
The Missouri Comprimise happened in 1820.