This is more complicated. USA after WW2 wanted to dismantle colonial powers and reduce military of European countries. USA become hegemony and as such It needed

This is more complicated. USA after WW2 wanted to dismantle colonial powers and reduce military of European countries. USA become hegemony and as such It needed to take responsibility. Today the world is becoming multipolar and US already tried to reduce involvement in Europe security by both Trump and Biden. Unfortunately German become old and greedy, France care more about African post colonies than Eastern Europe and UK decided that is not part of Europe.