I could make an argument that post WW2 is when large majority moved from farming into cities & lost their insular neighbors they had for generations. But that wouldn't override the colonization & racism USA was grown on. Nor our lack of properly dealing with it even today.

Europe and Japan may have pulled together to reconstruct their various countries. IDK. 🤷🏻‍♀️

Humans are human. Some will seek goodness & growth. Some won't. Not sure if my goal of world peace can ever come true. Still worthy to attempt it, even knowing history.