The concept of “race” in humans might more accurately be termed “breeds” or “sub-species” within the human family. Many Chinese people I’ve come into contact with describe different races as human breeds. This language is relatively common outside the Anglo-sphere.

A simple argument proving a possible link between race and intelligence / temperament is to compare the races to the genetically equivalent breeds of domesticated animals that obviously differ in average intelligence and temperament.

If different dog breeds differ in intelligence and temperament there is almost no scientific reason to assume this is impossible in humans.