Sir John, even saying that humans are the same species isnt definately correct.
Many biologists believe that the tendency to view races as a social construct, or as "not biologically significant," is incorrect, and is influenced not by science but by racial politics and political correctness. They claim that researchers on racial differences are often attacked as racists, even if said researchers have liberal sociopolitical views and claim to be against racism.

We are not a monotypic species anyway. whatever happens, there are sub species. scientists such as (google search for names!) Ralph L. Holloway, Professor of Anthropology, Columbia University; Arthur Jensen, University of California-Berkeley; Joseph Carroll, University of Missouri-St. Louis; and Thomas J. Bouchard, Jr., Prof. of Psychology, University of Minnesota.
These guys have pointed out that racial differences in humans exceed the differences that separate subspecies or even species in such other primates as gorillas and chimpanzees.

Races are very different. Differnet coloured skin, genetics, make up, body and muscle types, vulerabilities to illnesses etc.
To point that out, would land you in hot water.

James