[quote]If so, why not?[/quote] Because we don't need to. The United States takes up the full breadth of the North American Continent. We can travel the distance equivalent from the Straights of Gibraltar...all the way to Moscow....and still be in the same country...and speak the same language. Since we are nation of immigrants....and not a single ethnic group or nationality....common language is a powerful unifying force in the country. So virtually everyone learns to speak it....and those who don't find themselves culturally and economically isolated. Since their is very little functional reason why most Americans need to to learn a language other than English, the vast majority don't.