That's a decent summary of the role of slavery in the war and I would only nitpick a few things. That said, it sounds like the author might have come to those

That's a decent summary of the role of slavery in the war and I would only nitpick a few things. That said, it sounds like the author might have come to those (correct) conclusions by reading a single book. This can be dangerous and I would caution everyone to read a couple of books on contentious topics just to make sure they're getting a rounded view. (And that introduces the danger of both-sides-ism, which is its own problem. It ain't always easy.)