Slave States
Free States
The rest weren't organized enough to be considered slave states or free states.
Montana was not a slave state or a state of any kind during the Civil War. Missouri, however, was a Slave State that did not secede.
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15 slave states and 19 free states during the American Civil War
So the balance of slave to free states were equal in congress
15 free states
If its the end of slavery then all of the states were free
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