I don't think you can really make that claim about the Europeans being less tolerant of conflict. After the first world war, it only took a couple of decades t

I don't think you can really make that claim about the Europeans being less tolerant of conflict. After the first world war, it only took a couple of decades to start an even bigger war. Then, the whole continent got effectively carved up into alliances with two outsid!e superpowers. All the periods of European peace, historically, correspond to some power/empire dominating at least much of the place, and the post-WW2 situation is not really different. Nowadays, the effort is to make that one dominant power enforcing peace Europe itself.