Just for the record, as the day ends on the West Coast:
The Civil War was a rebellion against a democratically-elected government by white southerners when they lost an election in a system rigged to protect them. They committed treason in order to preserve their ability to enslave African-Americans.
Fortunately enough, the good guys won and the bad guys lost. The biggest problem was that Reconstruction did not go far enough and ended too soon.
The Confederate flag is a banner of treason and oppression.
That is all.