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There were 12 slave states after the Missouri Compromise and 12 free states.
In 1820, Missouri was a slave state, and it was one of the states involved in the Missouri Compromise. At that time, there were 11 slave states in the United States. The Missouri Compromise allowed Missouri to enter the Union as a slave state while Maine entered as a free state, maintaining the balance between free and slave states.
In America there was 11 free states and 11 slave states, before the compromise.
After the Missouri Compromise of 1820, there were essentially two designated slave territories: Missouri, which was admitted as a slave state, and Arkansas Territory (which later became Arkansas). The compromise aimed to maintain the balance between free and slave states, allowing slavery in Missouri while prohibiting it north of the 36°30' parallel, except for Missouri itself. Thus, the compromise established a clear boundary for the expansion of slavery in the western territories.
After the Missouri Compromise of 1820, the Senate was balanced with 12 free states and 12 slave states, each having two senators. This compromise allowed Missouri to enter as a slave state while Maine entered as a free state, maintaining the equilibrium. Thus, each region—free and slave—had an equal representation of 24 senators in total.
Two states were allowed into the Union, Missouri as a slave state and Maine as a free state. http://www.loc.gov/rr/program/bib/ourdocs/Missouri.html
In 1819, there were 11 slave states in the United States. These states were part of the contentious debate over the expansion of slavery into new territories, particularly highlighted by the Missouri Compromise of that year, which admitted Missouri as a slave state and Maine as a free state to maintain the balance between free and slave states. This was a significant moment in American history as it set the stage for ongoing conflicts over slavery.
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The Missouri Compromise set kind of a boundary between slave states and free states. The states South of the Missouri border were labeled as "slave" states and those north were labeled "free" states.
Resulting from the Missouri was a division of territory west of that state being divided north and south between possible slave and free states. Also, to keep a balance of slave and free states in Congress, Maine was admitted as a free state at the same time Missouri became a slave state.
In 1820, the United States had 24 states. This number included states that were part of the original 13 colonies as well as those admitted into the Union in the years following. The admission of Missouri in 1821 as part of the Missouri Compromise was significant in maintaining the balance between free and slave states.