The rebels were born as Americans, subjected to a Crown. I’m well aware not all Southerners owned slaves. They were used as tools by an elite, land owning and slave holding class.
And tell me, if the South had won the war what would have become of the slaves? Would they have been set free?
No the rebels were born mostly as English colonists. There were no Americans and even pre-ACW most people were indeed most dedicated to their states/colonies.
The Union soldiers fought against slavery, I am glad slavery was abolished, and think it would have been better not to fight the Civil War. But unlike Elizabeth Warren, and apparently you, I don't want to destroy monuments and graves of those who believed in fighting for their states.