"the influence of genes on intelligence varies according to people's social class in the US, but not in Western Europe or Australia. "
"That is, the relatively robust healthcare and social-welfare programs in Western Europe and Australia may buffer some of the negative environmental effects typically associated with poverty."
What you write is not applicable, for many reasons.
What basis do you have for saying that?
1. Rich neighborhoods result in well-funded schools with the resources to provide a superior education, better than the not-well-funded schools that are in poor neighborhoods.
Or
2. A superior education comes from "children's efforts" and kids that put in a lot of effort coincidentally all live in the same school districts, which also coincidentally are located in the richest neighborhoods?
Abject poverty is likely to have way more impact on kids performance in school than any level of school funding. Whether you want to lump that in with "children's efforts" or not, it's certainly exogenous to the school.
Coping skills and resources. Reminds me of
Privilege and inequality in Silicon Valley https://medium.com/tech-diversity-files/privilege-and-inequa...