I heard that a lot of times from mostly uneducated people. All nations have equal level of intelligence. The difference might be access to education, environment, common wealth, and social inequality.
This seems like a dogmatic response rather than a reasoned one. All other aspects of human beings vary by region to some degree, why would intellectual be an exception?
Edit: I would argue to the contrary, that there is a appreciable difference in average IQ between some countries which expresses itself among other things in GDP and quality of life. Perhaps the nature of this difference is based on things like nutrition, environment quality, pre-natal screening and care, so improvements in all these things will decrease the gap. If it happens that after all of that there is still a certain gap , who cares? As long as the citizens live in peace and relative prosperity.
I heard that a lot of times from mostly uneducated people. All nations have equal level of intelligence. The difference might be access to education, environment, common wealth, and social inequality.