slavery was just the issue at the time, completely irrelevant to the justification of seceding
Exactly it WAS the issue that led to it. "I wann keep my slaves, and you can't tell me what to do. Therefore I don't want to be a part of this nation so I am leaving, Goodbye."
that whole slave state vs free state may be played out again in English speaking state vs Spanish speaking
state.
Go back and please read what you wrote. That is like saying that Tiger's cheating is not what led to the divorce, it was a issue at the the time, totally irrelevant to her wanting a divorce.
As the saying goes, every action has a reaction.