It's not hard to comprehend at all. There are absolutely some Americans that don't want to be citizens of the US. They'd prefer to be citizens of the failed Confederacy. And for all of you, I say, go ahead, take GA and FL and GTFO.
Black Americans, whose forced labor drove the early development of the U.S. that would later allow it to become what it is today, want what should have been paid to them centuries ago, with interest, from their country, the United States. As a fellow U.S. citizen, and as a white man, I agree with them.