My honors US history professor taught us the Civil War was all about trade. Well, yeah, that was certainly an important part, Northern industry vs. agrarian South. It was a huge part of the war, both how it started and how it played out.
By FFS, did the man never read the various states letters of succession?! Here go a few.
And seriously people, read those letters. Don’t clap yourself on the back for regurgitating, “It was SLAVERY!” Come at it from a learned point of view or you’re no better than anyone else talking shit.