That is absolute nonsense. While it was referred to in different ways--PC isn't a new invention--the South's peculiar situation, state's rights, and several others, the fact of the matter is that the right that the southern states were fighting for was the right to keep human chattel. Everything else was window dressing. You don't believe me, how about Alexander Stephens, Vice President of the CSA then comparing the US Constitution with that of the Conferacy:
"Our new Government is founded upon exactly the opposite ideas; its foundations are laid, its cornerstone rests, upon the great truth that the negro is not equal to the white man; that slavery, subordination to the superior race, is his natural and normal condition." It wasn't until AFTER the Civil War that the idea that it was fought for other issues was brought forward.
That was the cornerstone of the Confederate Government. Not taxes. Not trade, nor States' rights. Slavery. The rest, as I said, was window dressing.