You would think it an obvious point. Not to this Trump supporter (quoted in the Washington Post):
Here’s a little history lesson: the Confederate States rebelled against the United States of America. In other words, Confederates did not want to be Americans, in the sense of citizens of the United States of America. They rejected this great country. The took up arms against this great country. Anybody who wears a Confederate uniform is idealizing traitors, traitors who killed American citizens.
Truly America?