Roy E. Finkenbine gives a brief, but worthwhile, overview of the white supremacists’ efforts to “take our country back” (i.e. restore white supremacy). He writes, “The Civil War decided the questions of slavery and Confederate independence, but it didn’t quash hopes for a continuation of white nationalism.”
Read his summary of this history here:
History News Network | The Long Campaign by White Supremacists to “Take Our Country Back”.