Race doesn't exist biologically because different societies have different racial systems and because race changes over time at a rate much faster than biological evolution. For example, Latin America has races that don't exist in the US like Mestizos and Mullatos. When Mestizos or Mullatos come to the US they're usually considered Native American or Black. What are multiple different races in Latin America are grouped together into a single race in the US. A century ago Irish in the US used to be considered an entirely different (and inferior) race. Today they're considered white, even though their genetic makeup hasn't changed significantly. If race was a biological construct then it should be constant in all societies, not change all the time. Race is really just a modern variant of caste.
So-called race-specific diseases do not exist. Take Sickle-Cell Anemia:
"because sickle cells offer immunity to malaria, the condition exists wherever malaria exists. American blacks descended primarily from West African blacks, where malaria is abundant. But Graves notes that the disease is also present in Greece and Yemen. Had colonial American slaves been Greek or Yemeni, sickle cell anemia would be known to Americans as a Greek or Yemeni disease, not a black one." (
Source)
In the US, Greeks are generally treated as Whites and Yemeni as Arabs.
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