Leaving the Corwin Amendment completely out of the picture, in 1860 there were 33 states. 15 of those states were slave states. To abolish slavery would have required a constitutional amendment. A constitutional amendment requires 3/4ths of all the states to pass it.
In a Union of 33 states, it would require 25 states to vote in favor of an amendment to pass it.
33-15 = 18 states in favor of abolishing slavery. The amendment fails massively.
But wait! There's more!
In order to override the votes of 15 states, we would have to have a union in which 15 states represents 25% of the vote. It would require a Union of 60 states with 45 states voting to abolish slavery, while the 15 voted to keep it.
We still do not yet have a Union of 60 states. We only have 50. It was therefore literally impossible to legally abolish slavery in the United States.
So when I tell you that slavery would have continued indefinitely in the United States, I am telling you the truth, not some made up bullsh*t that makes me feel good because I like the way it sounds.
So long as the Southern states remained in the United States, slavery would have been fully preserved by the laws of the United States.
If necessary, I can show you the math again, but it's pretty simple, and I think you can understand it.
Clearly Johnny Reb was not as confident that slavery would always be legal. They said otherwise in their secession documents.
“ To abolish slavery would have required a constitutional amendment. ”
Hmmm, it had already been outlawed in several states without one. How was that possible?