I doubt there was ever even one Confederate soldier who went to battle for the rich Plantation owners. At the beginning, it was about State's Rights and the oppression the northern States had placed on the South. All of the South.
Slavery was, at the time,a contentious issue but,,; The fight was over the application of the Constitution, not slavery.
When the war between the States was over, the Union had won. At the end of it, we had taken or destroyed everything they, the rebelling states, owned. Their property, their economy, a good many of their lives, and their sovereignty. It was proper and honorable that we left them, at least, their heroes.
It is a despicable betrayal that we now, 10 generations and 150 years later, demand the extraction of that as well. The Oppression was of that time. Those people are not enslaved or oppressed today. Therefor, their basis for anger ,,,,; is a LIE.
Though the first to "out law" slavery, the Brits were not the first to do it outright. They outlawed the buying and selling of slaves but not the possession of them. And it continued in their colonies well into the 20th century.
The British had practiced slavery for over 1,000 years, the French, Spanish Germans, Italians and Greeks, even longer. OTOH our young nation matured and abolished it outright and completely after only 70 years. At great cost of life and treasure. But no loss of honor.
America has no reason to feel shame for it's pubescent history,,, with the possible exception of what we are experiencing today.