I’ve seen evidence that much of this is arguably related more to demography than actual differences in education.
Children of Swedish ancestry in America outperform average Swedes.
Children of Japanese ancestry in America outperform average Japanese.
Children of African ancestry in America outperform average Africans.
Etc. By just about every country. The difference is that America averages in a lot (and increasing numbers) of people who are from low-performing ethnic groups.
See my post above. Your odd thesis fails in the face of real evidence.