Race is a real legitmate categorization of humans. It’s not just a social construct. yes the USA has more mixture than other places but still the vast majority of whites in the USA are all European blood. Most blacks in the US are about 20% white.
But only they United States has the stupid category known as “Hispanic.” Creating a “mestizo” category would have made more sense, but the Anglo-Saxon caucus among the elites never wanted to acknowledge racially mixed peoples.
All I know is that race is used for more political purposes then anything else. That is one reason I am not a Democrat they use race as a political tool which is something I despise. You are right that with modern genetics they can trace ancestry pretty accurately. What gets my goat is that with the way race is used. I prefer to judge people by who they are as a person. The liberals, the very ones claiming to champion “equality” are the very ones holding it back.