This is an extremely difficult question to answer. Three main possibilities exist:
1. The Union breaks up into two or three parts (North and Confederacy, or North, South and West). If the slaves were not freed, much of the point of continuing the Civil War would have been lost. The Union would have not formed badly needed divisions from newly emancipated slaves.
2. North and South go their separate ways, but since the Confederate States become one of the few countries still allowing slavery, European liberal nations place economic pressure on them to end slavery. After some years, probably a generation or more, the South finally gives up slavery as uneconomical.
3. The North and South agree to work together to revise the Constitution to specify when and where slavery can exist. They remain together as a loose nation with very strong state's rights. Eventually, economic and social pressure, together with the advent of mechanized farming, make slavery entirely unnecessary and unprofitable.
the slaves in the south were freed by the Emancipation Proclamation.
what was the return to Africa like for the freed slaves this is not an answer.
Harriet Tubman, freed many slaves in the 1800s.
almost 4 million slaves been freed
Liberia is largely populated by freed slaves
to make a homeland for freed slaves in Africa
Abraham Lincoln freed the slaves
Harriet Tubman, because she freed slaves and in The Bible Moses freed people
two years.
Freed slaves were heavily discriminated against and were denied many rights.
The Torah relates that Moses freed the slaves, with God's help.
Abraham Lincoln freed the slavery