Actually I may have overstated that a bit. Iowa--the state I live in--is the only remaining state that does not have unified curriculum standards (based on the principle of local control). Although state standards are going to be in place here next year. As far as I know, every state has a state-wide "world history" requirement. But some schools still treat this as a western civ course with a few non-western items mixed but fundamentally a Eurocentric narrative of human history.