The Republican party was founded by members of the Whig party over slavery - they were against it. Economies based on slavery are also dependent on slavery as it becomes the basis of the economy itself. A threat against slavery therefore threatens any economy which has slavery.
I don't deny anything you said but there is an underlayment here that, basically threatened the entire economy of the South. This, in turn .............
Right now, incidentally, we have seen a Republican party get taken over by a man who has pretty well laid out where he is at. All soldiers, especially those who got killed in one of our wars are "suckers", he likes to grab women by their (you know), he lies even when the truth is better, he was a TV star, he has failed at virtually anything he has ever done. All this is true and verifiable, He also has millions of followers. The civil war happened for very specific reasons beginning with the creation of the Republican party. We now have a situation where we seem to be moving onto another civil war and I think that the Trump takeover of one of our main political parties is just the beginning.