This isn't a culture argument or even a sound/good argument for anything. Americans are just wealthier and you can't compare like that.

When you compare groups of students within the same country and adjust for both household income and intelligence you find that (again, even within the same intelligence brackets and income levels) some ethnic groups simply study more while others spend more time on things like unprovoked violence.

Id ask you for a citation, but I know it doesn’t exist.