I’m now dumber for having read through this thread between you two.
Intelligence moves along a bell curve by race. It’s not that we’re all smart, or we’re all dumb by race. There’s simply a higher likelihood of being dumber or smarter on avg depending on your race.
Those legal immigrants that are successful in the US are successful by selection bias. They figured out out to get here, stay here, and make money here.
Of course they’ll be more intelligent.
Does culture have an effect here?
Sure.
So does biology.