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Not that I agree with OP, but it doesn't necessarily follow that there can't be genetic variation within the races. There can also potentially be sub-populations within races.
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South Sudan and Chad are taller than the world average, and Jews and Asians are shorter than the world average.

You claimed that there are three races, but then you immediately named four, and obviously lots of people don't fit into either of these.
If the Jewish, the Asians, the South Sudanese are the three races, then which race do Scandinavians fit into? And what about the Italians? And the slavs? Which race are Tamils? Which race are native Australians? Which race are Canadian first nations? Which race are mayans? >

All Europeans, Tamils and Semitic peoples to my knowledge are all Caucasians. The origin of Australian Aboriginese is disputed because we’ve observed a phenotypic mixture between various African/asian traits… I think the best theory is that they migrated from Africa, came to asian along the way, and ended up there really long ago, and have since highly differentiated on their own. I just wouldn’t classify them as a major race, because their population and culture has dwindled massively as a result of colonialism >


All Europeans, Tamils and Semitic peoples to my knowledge are all Caucasians. 

But there are genetic differences between them... How can they be the same race?