Who knows how the world’s approach to slavery would have progressed? If the civil war didn’t take place, the US may have been very different. A different US makes the world from 1860 forward very different.
You’re saying that the current view of slavery as evil evolved independent of the civil war. That the view of slavery as evil would have grown even without the civil war. That does not logically follow. For all we know, half the country would have still kept slaves forever.
No, I'm NOT saying the current view of slavery evolved independent of the Civil War, I'm saying... It MIGHT have. England had already moved to ban the practice, as had much of Europe. Are they really all that much more civilized than Southern Americans?
Clearly... it would have taken longer. Maybe, much longer. But, I believe public pressure from religious people IN THE SOUTH, along with commercial pressure from the South's customers, in Europe, would have convinced Southern plantation owners to free their slaves, and instead... pay them a pittance in wages.
It's more or less the same thing OUR country has done in places like China and Indonesia.