Even looking at the entire population, the U.S. has higher reading scores on PISA than the big western european countries (UK, Germany, France, Italy): https://www.oecd.org/en/publications/2019/12/pisa-2018-resul.... In reading, the U.S. was basically tied with Japan and the Scandinavian countries.

That is consistent with other international measurements: https://nces.ed.gov/fastfacts/display.asp?id=1. For example, the U.S. is one of the top performers in the world in the 4th grade literacy--behind Hong Kong but ahead of Macau. In 4th grade math, the U.S. isn't as good, well behind Hong Kong, Singapore, and Japan. But still comfortably ahead of Germany, Italy, Spain, and France.