Reparations have been paid in the form of Human Sacrifice.
1861-1865
Over 700,000 dead
tens of thousands with lost arms, legs, eyes, families, farms homes destroyed.
Paid in full.
But not to stop slavery. They fought because the corrupt regime of Washington DC wanted to *CONTROL* the economic output of the South. They wanted to control it because their wealthy backers in the North were making huge amounts of money from controlling it.
We know the government didn't care about slavery because they tried to pass a constitutional amendment to make slavery permanently legal in the United States.
This amendment was the "Corwin Amendment." Lincoln pushed this amendment hard, calling for it's passage in his first inaugural address.
The war was over money, not over slaves.