I thought the whole justification of the winning side is that they were.
Fire Memes for Traitor-Haters
Where we meme (joking in tone and detail, serious in sentiment) about General Sherman, the Civil War, and how the secesh traitors had it coming.
I mean, whether the Confederates were or were not Americans was secondary to the issue of "Can American states secede unilaterally?" to which the Union response was an overwhelming "No."
Judging by how many ran off to Brazil after the war was over, I think it's fair to not consider them (US) Americans.
The justification was that the land the traitors were claiming as their own belonged to America. If they wanted to stop being Americans they had every right to leave, they just had no right take parts of America with them.
didn't an act of Congress recognize Confederate soldiers as American Veterans?
they were forced to be americans whether they liked it or not.