In spite of the Corwin Amendment, the abolitionists would have kept pushing.
Think of the Indian treaties.
What is signed doesn’t always hold.
They could have kept pushing all they liked but they couldn't have done a damn thing about it. The gun grabbers keep pushing to ban guns but the 2nd amendment is part of the constitution and there's nothing they can do about that. So they're never going to get their wish.
Think of the Indian treaties.
What is signed doesn’t always hold.
Slavery was eventually going to go away on it's own. The social pressures were building in the ruling class of the South, and eventually they would all just want to get out of it so they could be accepted in the rest of rich society in the other states.
Charles Dickens talks about this in his "notes on America". In it he details conversations he had with wealthy slave owning families who wanted out, but were not sure how to do it without causing a disaster for themselves and their communities.
Rest assured, the social pressure would have never stopped, and if anything would have increased over time, while the economic benefit of having slaves was decreasing with each passing year.
Once mechanical equipment came available that could replace the vast majority of slave labor, it would have quickly rendered slavery obsolete and embarrassing.
In fact, it would have only lingered as an embarrassment in the Constitution known as the 13th amendment.