Really? We have since the beginning of America. Here in the Midwest, German schools weren't uncommon before the war.Another big problem is multiculturalism. (Not multiethnic)
We can't survive without adhering to one CULTURE (American) in this country.
The Confederate Flag issue of recent shows how we haven't had one culture.
Or maybe I'm misunderstanding - just what do you believe is "American Culture"? I have my idea, but I'd like to hear yours.