The Slavic, Celtic, Germanic, and Baltic languages all came from a common source. Ukrainians and British actually are both descended from the same people if you go back to 3000 BC. That's not enough time to evolve significant racial differences.
However, the negroes and Europeans have been separate for at least 50,000 years, probably over 100,000 years. That's enough time to evolve major differences.
I think negroes are a different sub-species, while Asians, American Indians and Whites are just different races of the same sub-species.
While an Oriental who was raised by white parents will think and behave just like any white person, a negro raised by white parents will still think and behave differently than whites when he reaches adulthood. For example, that person will typically be more promiscious and impulsive than whites.
Homo Sapiens Africanus
Homo Sapiens Sapiens
48 Women Raped Every Hour In Congo
Anybody who denies there are innate differences in the way negroes and whites think and behave is either a fool or a liar.
However, all races including negroes are part of the same species, homo sapiens.