No two ways to it. None of the Southern leadership in 1861 believed slavery was dying, much less that it would be dead within 5 years. And there aren't any quotes from any of them that indicates otherwise. It's you who can't have it both ways. You can't launch a cause based on slavery and believe it was doomed to an early demise.
I didn’t. You injected such nonsense and have painted yourself into a corner with it.
I suggest you put the shovel down while you are behind.