I belong to a couple of teachers' social networking sites, some of which have international members.
Somebody posted two secondary timetables from public (ie state) schools - one from a middle class area of Boston and another from a small town in the Mid West. The difference between the two was staggering. There is no National Curriculum in America, so the states decide what should be taught.
The Boston curriculum was very similar to what pupils in the UK learn - a balanced curriculum with English, maths, science, humanities, languages, creative arts. The Mid West timetable was math(s), English and that was about it. A primary school in the UK teaches a broader range of subjects.
It's no wonder that some Americans don't have much of an idea about the world outside the US.