Which had been going on in North America for hundreds of years and which, in 1861, the Confederate leaders expected to continue for generations. They must not have thought it was all that terrible.
I don’t think anybody in the South thought slavery was going to continue in perpetuity. The Civil War was about more than just slavery. Everyone knew mechanization was the coming thing.
If you are of the misguided assumption that the Southern businessmen operated in a vacuum and had no interaction with the rest of the country you would be wrong.
If you want to have an argument about just bashing the South that’s fine but the discussion here is really about the fact that in 1861 the US and the world was on the cusp of the industrial revolution and things were changing very quickly. If the Civil War had never happened slavery would stll have been on the way out and fairly quickly.