I know but how many years isolation have we had before the real travel age, therefore each race has different traits in our dna, look at african noses compared to northern european noses, the chinese smaller peoples compared to most of the west, also bone densities, hair and eye colour, out inner traveler/ explorer, where the we native tribes who didnt travel. Theres a lot more im sure. The buildings of our cities, houses, transport systems, tech, etc etc, there is differences 100% but thats not a negative thing either