White nationalists comprise a small minority in the U.S., even among white Americans. I think philosophically refighting the Civil War is a futile and reactionary cause in any case and it's preposterous to assume that the white nationalist movement has anywhere near enough influence to start a new civil war. I have lots of (white) relatives, including two siblings, who live in the U.S. and have never gotten the impression from any of them that Americans in general want to move backwards on civil rights.