Nuclear weapons don't actually have that much of an impact. They don't do anything socially or economically. They don't prevent all conventional warfare either. If one country annexes territory from another and the target responds with a threat to nuke the aggressor, the aggressor can just call their bluff. Mutual destruction over a flesh wound isn't credible. The only things nukes do is ensure that actors can't be forced off the stage with military conquest. Barring that, the rest of the military-economic-social game plays on as it did before the nuclear age.