Millions of species evolved into smaller sizes. It is called adapt or perish depending on circumstances. Why are Pigmy people short while some tribes in east Africa are tall? Pigmy’s live in tropical jungle where it is easier to move under trees for short people. Those tall tribes in east Africa cultivate cows and live in desert like land. They grew tall from drinking more milk and did not have to now down under trees. Survival of those who adapt & change drives evolution.
It is extremely racist to believe that white people are more evolved than those of other colors. 