In spite of innumerable attempts to prove that such a linkage exists between physical and mental traits no one has succeeded in demonstrating it or even reasonably indicating that such a linkage exists. No geneticist, no biologist, no cultural or physical anthropologist has been able to concretely determine and define what a 'race' actually is. This is the groundwork for the idea behind the racist ideology of the 'pure races'. Racists talk of 'race' as if it were an objective tangible property, scientifically demonstrated. The fact that most if not all peoples are 'racially' mixed is consistently ignored.
Racists attempt to draw lines where no lines exist.
The conclusion drawn by all relevant evidence of comparative anatomy, paleontology, serology and genetics is that all varieties of human beings have the same remote ancestry. The more we learn about prehistoric peoples, including the 'fossil men', the more we realize that mankind has always been characterized by great diversity. The 'pure races' are a myth. As far as evidence is available, it indicates that 'race mixture' has always been characteristic of mankind. All peoples share so many fundamental similarities, despite superficial dissimilarities.