This stuff about the world being peaceful due to the industrial revolution doesn't make a lot of sense to me. For one thing, the IR significantly predated WW1 and WW2. It didn't prevent those, so how'd it cause the "long peace" afterwards? The predominant theory about this in international relations is hegemonic stability theory - https://en.wikipedia.org/wiki/Hegemonic_stability_theory - there have been several peri…
How often has the US been at not-war in that period?