"John, Iím not sure I understand your point here. My point is simple- if I move to another country I consider it my duty to learn their language- [...]
For generations that was the way it was here- immigrants would come to American- learn the language- and fit in."
My point is that what "the language" is (as well as culture, customs, laws, and other things that make up a "nation") has changed, is changing, and will change. To believe that it was ever not changing is a delusion - at best, it was either changing slowly enough that you could convince yourself that it wasn't, or the changes were happening "below the surface" (either you didn't interact with parts of the country's society where the changes were happening, or did not pay attention) and now you're only upset that they're gone so far that you can see them now.
It's not unique to the U.S. Northern parts of Italy have many German speaking regions. France has a large Algerian population, and of course in Vancouver I've seen more Chinese and Japanese signs than French (there were Mandarin campain ads in the last federal election).
Language changes, sic transit mundi.