Post war comparison would be an interesting topic to spend, oh... say.... 5 or 6 years studying to get the real answer to why Southern bitterness lingered so long after the war. Cultural submissiveness of the Japanese populace during te imperial reign had to have played a significant role in acceptance of US dominance - if what happened could indeed be called that.
In comparison to the post-WWII reconstruction, Southern occupation was seen immediately as a profiteering gig throughout the states of the Confederacy. Compare today's political relationship with Japan, 60 years after the war, to the attitudes of the 1930's, when even Northerners began to look back on the war as a means to establishing a Republican death-grip on US political power.
The same thought occurred to me after I had posted that -- his suggestion, actually, but a good thought. The English, Spanish, and U.S. civil wars could be compared among one another, and then Reconstruction compared with post-World War II reconstruction.
There was an ameliorative impulse in Americans of that generation that Europeans noticed at once whenever they came around them: one British woman once reflected that when the Americans showed up to take part in the War, it was as if someone had opened a window. Everything changed because of the guys who showed up to change it.
There was none of that attitude in the conquering Yankee armies, or in the locust-swarms of carpetbaggers and Union Club ideologues come south to turn freedmen into Republican cat's-paws.