I call this a guessing game, because, obviously, we cannot say what might have happened. Or rathr we can, but rapidly reach the point where we can say *anything * might have happened. So, I’m keeping the question to a relatively limited one:
Could the Confederacy really have survived and thrived in the post civil war era?
Here is the scenario: in 1864, a war-weary union washes its hands of the Confederacy and says “Good Riddance.” Lincoln is not re-elected, and McClellan, on apeace platform, becomes president. Yes, I know McClellan came in a war platform in actual fact. Bear with me. The Union retains its grip on military bases around Confederate territory, as well as West Virginia and East Tennessee, which becomes the state of Appalachia.
Jeff Davis proclaims his victory, blah blah blah.
The Confederacy’s problem, however, is that in peacetime, each states proclaims itself a sovereign entity. It has and can have no unifying political force: its entire raison d’etre is against it. The central government doesn’t have any power to compel any state to do anything (and I just don’t see, say, Texas, going along with Richmond out of loyalty).
Economically, I don’t see the Confederacy matching up to the Union. It had lost far too many skilled workers to the North, and had by this time attracted a great deal of unfriendly eyes in Europe. It was behind in industrialization and capitalization and the econmic leaders would have wanted to return to the labor-and-capital-inefficient cotton economy.
Moreover, the Confederate government invites future conflict since it will almost certainly be forced to try to expand westward. But the Union already has a strong base in California and Colorado and will resist. The COnfederacy will either have to accept limited expansion in very unfavorable terrain (for plantation economies) or expand into Mexico, which will spark vicious wars, or attack the Union.
Politically, a great many leading Confederates, including General Lee and their Vice President, harbored deep ambiguities concerning the Confederacy, and remained in it by sectional loyalties rather than any ideological agreement.
All in all, I have a hard time seeing the Confederacy remaining intact for more than 50 years, except possibly through sheer inertia.