These stats are thrown off by a number of factors that it would be imprudent to get into here. Control for demographic samples similar to the other countries and you'll see a very different picture.
And if your point isn't race or culture, but of economic disparity, that is sort of my point.
For what it's worth, I didn't go to any elite universities and I make less than 35,000 per year, so I don't have a horse in this race.
What I'm saying is that if you actually compare people with similar demographically-expected IQ and socioeconomic situations, Americans stack up fine. It's the extenuating circumstances that drag the overall averages down.
All that really means is that overall averages across 300 million people aren't that useful.