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There were 12 slave states after the Missouri Compromise.
11
In America there was 11 free states and 11 slave states, before the compromise.
Stephen Douglas was eager to develop west of his home from Illionois. As a result, he suggested to form two new territories : Kansas and Nebraska. However, many Southerners rejected the idea because under the Missouri Compromise, the territories would be admitted as free states. Douglas then proposed that the upcoming territories would be decided by popular sovereignty, earning the South's favor and thus, removing the Missouri Compromise.
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.
The Missouri compromise was one of the many ways the boundaries of America grew. The compromise admitted Missouri as a state and also brought the question of slavery to the forefront of many minds.
Many abolitionists refused to support the Missouri Compromise because it allowed for the expansion of slavery into new territories, which went against their goal of ending slavery altogether. They believed that compromising on the issue would only serve to perpetuate the institution of slavery.
The Missouri compromise made Missouri a slave state and so naturally put it into the Confederate camp when the Civil War broke out. Free state Illinois is just across the Mississippi River from St. Louis so there many ties with the Union as well.
Political parties avoided the issue of slavery for many years after the Missouri compromise.
Political parties avoided the issue of slavery for many years after the Missouri compromise.
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
18 states were free states, 15 states were slave states 33 states overall