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First...I guess you could say the cause of the Civil War was federal government vs. states rights--but that was about slavery, right? Or was there something else at play?
Second, I don't know anyone who's saying about slavery and the confederacy, "cover it all up." It would be preposterous to try to erase that history (or any history). Isn't the transfer of those statues/images to museums quite a different thing?
BTW, on that note, the teaching of the history of the Third Reich in German schools today should be a model for all of us.