Check out this Associated Press article on Breitbart.com about the conflict between the Dutch-speaking Flemish and the French-speaking Walloons of Belgium. They are experiencing the same bilingual problems that Canada has had.
These are examples of exactly why we need to have English as the official language of the entire United States, at the federal and state levels. Bilingualism simply is a recipe for conflict, a recipe which we must avoid. Printing ballots in multiple languages and public school teaching in multiple languages are things we do now that we should stop.