The aristocratic plantation society wouldn’t survive, and would probably collapse within a generation; after which the USA/CSA would reunite. The ascension of American as the leading industrial nation would probably be delayed.
One thing to consider is that when Germany united in 1871, they would have had an eye for gaining influence in the Americas, would they have reached out to the CSA?
What on earth would have compelled the to reunite? What would it have taken for the U.S. to reunite with Great Britain after having won our independence?
I think this is a good prediction, though I think the USA would have melted into the CSA.
That is what MacKinlay Kantor thought and wrote about in his book published a century after the war. But it a silly and sentimental notion.
How many independent nations willingly give up their independence?
Usually national elites, institutions, and sentiments grow up that give new nations an interest in independence.
Rivalries that arise between nations, especially after bloody wars, may weaken over time, but not to the point that they surrender their sovereignty.
I think this is a good prediction, though I think the USA would have melted into the CSA.
Some troll or other will always say something absurd like that, thinking that it will make him interesting to people.