America was the only country that came out of the war richer than when ti went in.
Wrong. The USA came out of the war thrust in a position of world superpower and leader of the Western World. It's not a position we wanted or strived to attain.
In a few short years we had to adjust to the fact that European problems were now American problems and always will be in the Future. Think anything has changed? Europe screams at America to clean up her messes and then cry's big tears when we do.
Look at Germany. Screams for the US to get it's Military Bases out. We say sure and withdraw. Then the crying starts over German jobs, contracts, and big fat wad of money US taxpayers shovel out.
You want to damn the US for being isolationist then want to turn around and blame the US for stepping up to the position Europe put us in.
Maybe if you had not adopted a policy of appeasement or constantly knuckle under to the threat of force things would be different. Seems Europe wants to take that same path today.