It's complicated stuff. Back when we raced around the world to defeat where we could to protect our reputation as the greatest, non-aggressive superpower. We were a beat up lot by the time we realized, um, this "saving face" is a) costing us even more debt, b) most of the world felt we owed them an apology for infinitely making things worse wherever and whenever we got involved, and c) what's coming for "us" someday is truly evil and God, the One in which we trust, is letting this happen.
It was devastating enough to realize these things and go on. But something else happened too. This was recorded in story form in the movie (i)Monstrum(i). The old Asian-world way, well, it, uh, changed. In the Old World there was the Hail Mary pass of zero-ing out differences, and preserving honor. Old World court systems upheld usually the Royal honor, or the Emperor's honor, or the State Ruler's "honor". WWI proved that geo-politics (where we get "sphere" and similar geopolitical terms that rival sovereignty) was as much traditional parity of military with command-in-chief as it was about personality/influence. All of that hit its head on the iron curtains of soviet-style communism and the fort walls of TOP SECRET. And a lot of brutality and warfare development just happened alongside worldwide political "show".
The credit cards going global like "AID" money doled out a certain amount of "disposable" GDP and a sort of license to anyone and everyone to mess with "governance" and "rule" and prerogative.
Defending honor became first a match-to-match and then a game of survival anytime the rules of war were abandoned or there was "drift". Each time the world cycled through budgetary spending and bloodletting, the enemies were getting the better of each other...bankrupting, killing off, eliminating, isolating, running into debt and slavery, displacement, occupation, rinse and repeat.
China managed to cause the resistance to its ascendancy to "surrender". Islam caused its religious subjects "to submit". The U.S. chose careful interactions to preserve itself as a Republic by surviving but could not be "peace keeper". Everytime the world goes for being one big peaceloving democracy, we crash and burn, have hotspots, and worldwide disease and economic calamity.
World leaders largely agreed to prison guard their own nations. And sometimes there's a weeding of ties that bind. Done smartly, people put limits on what will be spent on a chaotic thing like a "war". It's why late 20th century presidential politics convene at summits with militaries' and organizations' input...to make better informed decisions. Humanity cannot survive the level of violence that is potential to reaching a certain level of "anything goes".
The current U.S. Republican administration is saavy to all of the 21st century updates. No one is ever right 100% of the time, but our current administration is actually working with a breadth and depth of ally to re-establish sanity to the absolute insanity of the violence. This I know for fact.