You use Quebec as an illustration against national language, but the situation in Quebec is exactly what most Americans want to prevent happening here (i.e. allowing an invasion of folks of different language and culture).
You do remember that the language and culture of the invaders was English in that they came well after the French (who were a little late in arriving themselves).
My ancestors were in no position to control the existing French population and made a number of legal agreements with them which include protection of French. As ridiculously costly as it is to maintain both languages we are very lucky to have this as a fundamental part of our country.
ABE
I might note that for a big part of your country the English speakers are also invaders over the existing Spanish speakers (though both were also late comers).
Edited by NosyNed, : added a thought
Edited by NosyNed, : No reason given.