This is just more "Lost Cause" tripe. If you think the Civil War was about "states rights" etc etc, read the Confederate Constitution.

“In all such territory the institution of negro slavery, as it now exists in the Confederate States, shall be recognized and protected by Congress and by the Territorial government; and the inhabitants of the several Confederate States and Territories shall have the right to take to such Territory any slaves lawfully held by them in any of the States or Territories of the Confederate States.”