SSS Two, You are mostly right. Texas is way far away from South Carolina. SC was much more concerned about taxes and tariffs. And of course SC was very much wanting to keep slavery. South Carolina was very much concerned about Lincoln and his ax to grind against the South.
I'm not sure what your point is. I just reviewed South Carolina's Declaration of Immediate Causes which induce and justify secession. Like all other states, South Carolina's primary reasons all revolved around slavery. The Declaraiton doesn't mention tariffs at all. In fact, the only time South Carolina mentioned taxes at all, it was in reference to the taxation of slaves.