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It has more to do with the fact that human differences are clinal, therefore there is not a clear line that separated asians and caucasians.
asians have been separated from caucasians for 100,000 years, whereas both have been seperated from africans for 200,000 years. Obviously there will be more genetic similarity between asians and caucasions due to this but that is still 100,000 years of separation in different climates, different diets, mating habits and cultures.
I think the problem is the term "race" itself, from what I know humans are not a race per se, they are a species, and what we define as different human races are not races but different breeds of human species. Similar to different breeds of cats and dogs, in fact I have heard that the different human breeds are more genetically different from one another than different breeds of dogs.
I'm no expert on race theory but from the research I have done, this is what I know: there are 3 or 4 different breeds of humans on this planet: mongoloid, negroid, caucasoid and australoid, the 4th one is still debatable as they are difficult to classify under any of the other 3 so they are considered their own breed.
The different breeds of humans have been shown to have many differences in averages in the following areas: bone structure, cranium size, maturation rates, ovulation rates, skin color, bone density, brain weight and size, fat deposits in the body and face, behavioural patterns, propensity to certain diseases and conditions, immune systems.
Now if all that is true and I'm not saying it is but they have done experiments on these things, Darwin was fascinated by this topic and ran multiple tests and measurements, followed by other scientists. Since then the topic of race has become far too controversial so for political reasons the findings of the research are not released to the public and it has now become a taboo subject.