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In America there was 11 free states and 11 slave states, before the compromise.
There were 12 slave states after the Missouri Compromise and 12 free states.
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18 states were free states, 15 states were slave states 33 states overall
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.
13, from the original 11, then adding Maine and Missouri.
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.
2 terms
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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
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.
A key feature of the Compromise of 1850 that upset Southerners was the admission of California as a free state. This disrupted the balance of power between free and slave states, tipping it in favor of the North. Additionally, while the compromise included a stronger Fugitive Slave Act, many Southerners felt that the concessions made to the North were insufficient to protect their interests in slavery.