It is difficult to hold your head up and defend the confederacy and admit the war was about slavery. No, a new reason had to be found and the cry of States Rights was used as a beard to obfuscate the reasons. It was difficult after WWll to find a German that admited knowing anything about the Halocaust just as it was and still is today finding a Japanese that admits to Nanking.
"It’s true, then, that South Carolina seceded over states’ rights: though, as neo-confederates are loath to admit, the specific right in question concerned the ownership of human chattel. One of the South’s persistent complaints was the northern states would not vigorously cooperate in the return of fugitive slaves and that the free states allowed antislavery organizations to flourish.
In other words, for South Carolina, slavery and states’ rights were not mutually exclusive; in fact, they were the same thing. Today too few people understand the intricate legal history that connects slavery to states’ rights — and as a result a needless debate continues, 150 years after secession began. "
This argument has been settled for many years. It is the fringes that continue to object. Organizations like the Sons and Daughters of the Confederacy and various other " Heritage" organizations still try to rewrite history. It cannot be rewritten though.
It was a hundred years after the Civil War that full citizenship was given to the decedents of slaves in the South. There was a history of lynchings, Ku Klux Klan rallies and separate facilities. Finally, it was the Civil Rights movement led by MLK that actually "freed" the slaves (figuratively). It wasn't till the 1960s that Blacks were even allowed to attend State Colleges in the South.
Now history revisionists are trying to make the point about States Rights? Absolutely Laughable! It is akin to Germans saying, " We moved Jews into those camps to keep them from being hurt during the war."