That is the very definition of race. That is what the term means.
If you look at genetics the difference between different parts of Africa is higher than the different between different non-African groups.
If you think that Whites and Asians have a different race but all Blacks have the same race than your concept of race is cultural and not based on biology.
If you look at genetics the difference between different parts of Africa is higher than the different between different non-African groups.
If you think that Whites and Asians have a different race but all Blacks have the same race than your concept of race is cultural and not based on biology.