The US has had, in its history, a large-scale immigration from just about every region of the world, and most of them have interbred. The result is a population with lots of outbreeding depression and heterosis, leading to a much wider variation in intelligence and other abilities than anywhere in the world. The ultimate outcome of that is a lower average intelligence in the US than in other countries, due to outbreeding depression, counterbalanced by a small number of exceptional people, who got lucky and benefited from heterosis.
Interesting idea. This suddenly makes me take my gf’s remark about how “mismatched” and “weird” average American faces tend to look a bit more seriously.
The US has had, in its history, a large-scale immigration from just about every region of the world, and most of them have interbred. The result is a population with lots of outbreeding depression and heterosis, leading to a much wider variation in intelligence and other abilities than anywhere in the world. The ultimate outcome of that is a lower average intelligence in the US than in other countries, due to outbreeding depression, counterbalanced by a small number of exceptional people, who got lucky and benefited from heterosis.
Interesting idea. This suddenly makes me take my gf’s remark about how “mismatched” and “weird” average American faces tend to look a bit more seriously.