After 1865, was there ever a point where a Second American Civil War was even marginally possible?

I think it was likely, because entire generations of Southern political class did not learn a damn thing about the first American Civil War thanks to the Lost Cause bullshit. If you are told over and over again that the cause you fought war is right and that you were undone by circumstances and were a plucky underdog, you might try again. You would just need to put a generation or two between the first war and second, for the people who actually fought and led the Southern rebellion in the first American Civil war to die out, as most of them would be the sane ones that knew the stark reality of the fighting and, for the most part, did not buy into the plucky underdog Lost Cause bullshit. I consider that the we (I'm an American, hence the royal "we") did not have a second civil war to be equal parts luck and happenstance as well as effort by intelligent men on both sides of the Mason-Dixie to make sure an armed conflict would not happen again.

But the South/Southern political class had their way on so many issues around the turn of the 20th century that there was absolutely no reason for the South to revolt again. The Southern leadership knew they had nothing to gain from it hence why there was no movement for it.
 
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