Did you read it? You cherry picked a few paragraphs, it also says a PEW research pole indicated 48% of Americans believe the war started over economics and states rights with 38% believing it was over slavery, the rest un decided. You must have some type of emotional connection to this debate as you are not using logic.
Lots of Americans still believing Lost Cause drivel is not evidence dude, especially compared to the actual stated reasons for secession.
As I said before, it started over one specific “state’s right”; the “state‘s right” to own slaves.