The one person who mentioned treaties in this thread has previously cited the Treaty of Guadelupe Hidalgo as banning an official language in the US. Suffice it to say, that's a misreading of the Treaty of Guadelupe Hidalgo.

As for other laws, I could be quite wrong on this, but if the goal is to eliminate the offering of government services in languages other than English, I wonder if a constitutional amendment would be required. At the least, I would foresee years of litigation on the issue.

You're absolutely right. And (this is going to sound horribly crass, but I'm gonna say it anyway), the whole discrimination thing has gone way too far. Anymore, everyone can find something to shout, "Discrimination!" at. Blondes are discriminated against because they're blonde. Overweight people are discriminated against because of their weight. Men are discriminated against because they're men. The list is endless. We (in the national sense) don't look for "tools" to enable us to discriminate. We (in the national sense) just look for a way to communicate with one another. If someone who speaks another language comes here to live, they, assuming they want to communicate effectively with us (nationally), need to learn our language. It's not a ploy, or a trick, or some underhanded scheme... it's a language for crying out loud. Learn it -- or don't. But don't expect us (nationally) to learn your language. After all, you're the one who came here.

(Yikes. Sorry for the rant.)