Nnnnot significantly.
Ultimately IQ is much, much stronger of a determinant of success, social value and not being a violent criminal piece of shit than national origin.
National origin can partially serve as a proxy for IQ but only partially.
And America began aggressively filtering for and developing high IQ stock only in the past 100 years or so.
We got a shitton of European immigrants and we had various institutional ways of separating the wheat from the chaff. Our universities used to be decent too.
Before then, there was a lot of ethnic tribalism that got in the way of filtering for IQ.
Like shit like an aristocracy or legacy admissions to colleges all weaken the ability to filter for IQ. It was a really smart move for the UK when they started to award knighthood and other titles for technical achievements and contributions to society versus just happening to be a lucky sperm.
I've said this elsewhere, but Griggs vs Duke Power Co needs to be overturned.