From a review:
I think Masters explanation for why the war was fought is better than most. As I said, we must judge wars based on their outcomes, not based on propaganda. By that metric, the slaves weren’t free and the resulting “union” was absurd. The South was no more united with the North than occupied France was united with the Third Reich. If you kill enough people, you get a union of some kind. To Masters’ point, there certainly was no union on the legal terms that prevailed prior to the fighting. In both cases, it’s impossible for the resulting outcome to justify the loss of life and the level of destruction.
Yet Masters’ view of what the US really was seems a bit naive. If the country really was teetering on the edge so precariously that a few men who believed they were the instruments of God’s will could bring it all down, then how long could it survive? Nevertheless, the US that emerges from the war sounds familiar: foreign interventions justified on religious grounds, a central government beholden to business interests, increasing centralization of all policy, nearly unlimited executive powers in wartime and so on.