he said "every other," and he specifically blamed the Republican party and Abraham Lincoln, even though South Carolina had seceded 12/20/60, and several others had follwed before Lincoln was inaugurated 3/4 /61
Based on what I have read of his interview on this topic, I don’t think he addresses the sectionalist issues in the united states in the early and mid-19th centuries at all. This was a much more complex topic than he is making it out to be, and I am not sure there was any logical reason to expect the southern states not to break away at some point, if not in 1860/61.