I mean…
This would require a complete overhaul of the franchise’s most recognizable enemies/factions, would need entirely different theming and ideas compared to the base games that would likely be better off as an entirely different series set in the same universe. Even then, you ask for less amerco-centric games/ideas and yet america was really on the world stage with their bombs in WWII. The whole theme of the series is chinese/american nationalism and globalization breaking down as each country vies for control of the last natural resources. AFAIK the bombs were only exchanged between china and america with europe and the middle east glassing each other earlier. The soviets also engaged in the exchange (?) and south america/latin america, australia, and antarctica were relatively intact (save for the nuclear fallout). I really think another west coast fallout taking place after FO4 would be great to see more of the NCR.
TL;DR: American nationalism is a core identity of the series and other NEARBY countries like mexico and canada should be reserved for DLC.
Well, when you live in huts like cavemen and your population is very spread out, of course you’re going to be less impactful. Shrinking the population WOULD help, no matter how much you scream about eugenics and fascism. Gonna be downvoted for this, but it’s just my opinion at the end of the day. No need to get butthurt, keyboard warriors.