The war was about States Rights...and had nothing to do with slavery until Lincoln threw that in.
I’m guessing that you’ve never read the Articles of Secession from the various Confederate states...
Many southern politicians disagreed, believing that the Federal fugitive slave law should preempt states' rights.
Thereupon the southern states seceded in order to form a new federal government of their own, under which states were not free to make their own laws regarding slavery.
So yes! the Civil War originated as a states' rights issue. It's just that the north was the pro states' rights side........