4 million
1
a lot
The Southern states wanted to keep their slaves, and they were worried that President Abraham Lincoln wanted to free the slaves, so many of the southern states left the union to try and keep their slaves.
By 1840 there were 26 states making up the United States. That number had expanded to 31 states by 1850.
Fifteen
4 million
Slavery, but only within the Confederacy. The Emancipation Proclamation didn't affect slaves in Union states. (But there weren't many slaves in Union states.)
1
a lot
Very few; only slaves in those states that had seceded from the union.
The Southern states wanted to keep their slaves, and they were worried that President Abraham Lincoln wanted to free the slaves, so many of the southern states left the union to try and keep their slaves.
No, not all slaves were seen as free people, but many of the slaves thought of the Union as 'allys' or 'friends', and the Union would do their best to help the slaves in their deeds; this also cause some of the conflict with the Confederacy, partially leading to Lincoln's death.
By 1840 there were 26 states making up the United States. That number had expanded to 31 states by 1850.
20
The Emancipation Proclamation freed the slaves in the states that were in rebellion. This put the onus on them to return to the Union or face the loss of slaves. Many slaves fled to the union lines where they were considered contraband property until the proclamation went into effect.
It technically freed the slaves in the states in rebellion, but not the ones in the Border states that had stayed loyal. In practice, it did not free many slaves, but the Union troops were licensed to liberate any slaves they came across in their Southern campaigns. These presently joined the Union armies.