Earlier quoted context omitted.
I have thought about this a lot, and concluded that the peace we have today largely stems from all major powers having nuclear weapons, and leadership in each understanding that avoiding nuclear war is the utmost priority. All foreign policy choices are aligned to prevent military confrontation and avoid nuclear war. Thus there is an overemphasis to resolve disputes through diplomacy. But the plebeians do not underst…
Economic interdependence is also a big factor. If you depend on someone selling you things or buying them from you, you have a lot more to lose by invading them.
It has some truth to it, but it doesn't survive looking at European history. In 1913 Germany and Britain were each other's largest trading partners, but a year later they ended up fighting each other in WWI. They fought again in WWII. Nuclear deterrence is a better explanation of post-WWII peace.