I see you’ve never been to (pick one of many places where the social conditions are such that anyone who makes it to an age of agency with their brain fully intact is almost guaranteed to leave because it’s intolerable for anyone who actually thinks much) unfortunately, until you’ve lived in one of those places, it’s easy to imagine that people are the same everywhere. They are not. Social conditions are an extremely strong force in the intellectual development of humans.

To imagine that there are not regions that are comparatively intellectually impoverished is a comforting illusion, but unfortunately it is not reflective of the statistical reality nor the subjective experience of living in one of those places. Culture is very much regional, and cultural (social) factors (along with their physiological consequences) are by far the strongest factor in intellectual development.