Which means, of course, that humans are presently in the process of evolutionary convergence due to interbreeding, not divergence.
Those populations are not isolated so much, anymore.
Also, Caucasians and East Asians contain measurable proportions of DNA from species of Homo other than sapiens.
Black Africans don’t.
I have no clue what that means, except that we aren’t “one race” other than metaphorically.
“Race” simply means breed, variety or sub-species, and is still used that way in other areas of biology.
Racists, of course, try to make race mean “species.” “Anti-racists” deny that humans are divided into races at all.
As you wrote: Which means, of course, that humans are presently in the process of evolutionary convergence due to interbreeding, not divergence. And add to that that modernization has created more similar selection pressures world-wide than existed in the past, and that is most certainly the case.
Though I think you go a little too far in asserting, “Racists, of course, try to make race mean ‘species.’ ‘Anti-racists’ deny that humans are divided into races at all.” Racism usually doesn’t get that far, and just decides that for some reason one group conceived of as a race ought to be maltreated (or at least differently treated) solely on the basis of group membership, usually for the perceived benefit of one’s own group, also conceived of as a race. Nor does anti-racism need to deny the existence of races, just regard every human being as uniquely valuable in a way that supports a presumption of equality before the law.
Unfortunately self-proclaimed ‘anti-racism’ has now become, itself, a species of racism what wishes to maltreat people of European (and often Asian) ancestry, and the only actual anti-racists left are Christian humanists (cf. MLK, Jr.’s remark about the content of character) and classical liberals (called conservatives in America).