We need a full year to answer other than 181.
15 slave states and 19 free states during the American Civil War
4
4 million
15 free states
15
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.
15 slave states and 19 free states during the American Civil War
4
In America there was 11 free states and 11 slave states, before the compromise.
4 million
15 free states
to many slave states being added into the union
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
There were 12 slave states after the Missouri Compromise and 12 free states.
15
If its the end of slavery then all of the states were free
18 states were free states, 15 states were slave states 33 states overall