I'm not sure what you mean by race in this post.
China is a country. Chinese is a nationality. Yes, there are different ethnicities and cultures in China.
African tribes are different from each other, I agree. But are the tribes different races? If so, how do you define race?
I should be clear, I think there are very real differences in ethnicities and cultures. But race is not based in biology or anything concrete. I think it's a widespread myth.
As in Tribes of one race ? their are tribes of one race, like the Jews came from a Semitic Race, but are only just one Tribe of that race, and the tribe is different or has different values etc.
In China we have 3 different race's and one can see directly the fact of them, they do all look very different.
In Australia we have 2 different looking Aboriginals back when Cook came here, The North type and the south type they claimed, The Aboriginals were very well breed to the land in the outback, they have a light bone thin like in the legs etc etc and hardy as they come, it's amazing that they can live to the age that they do under the conditions but many white race people are as weak as especially Pommy's not all tho ! weak breeding in such people etc etc, but the real Aboriginals did not have bastard breading like white people do.
The Aboriginals were given a wife and that was it, or you were killed, they had a system of who was right, so as to breed a healthy child, this was critical ! because of the harshness of the conditions and was the highest priority.
So when the white people started breeding with the Aboriginals but they were killed because they were no good for the Tribe, plus they have a different nature, a different type of dog one may say and it's a fact !
So race has a difference in fact. it's no myth.
Russian Slavic people are different to the West Europe race, they think and act somewhat differently, one has to come too understand them, then you can get along much better with them as a rule.
Back in the 1960 to 80's i could see or pick in general who came from where, but nowadays the younger generations are much more mixed, so one can not tell as easy as one once did, be he a Frog or North German or a South German or Sweden or Norway in general i could pick them out just by looking at them and they all have a different nature in general somewhat.
I could say back in the days that some one from North Germany was typical in general of their outlook and display but the South were clearly much different temperament, i found such typical in general. but things have changed nowadays, it's all different. so the younger generation would not have a clue because they never lived in them days to understand such.
A full breed Aboriginal will not work, a half cast could or may, be he half Islander or half White maybe.
Negros can work hard.
Pommy's in general are weak and will not work hard, but Scott's can work hard.