I had lunch last week in a Mexican restaurant here last week and ordered iced tea. I was suprised to find it was already sweetened! They're learning.
I'll bet they didn't have any of those mint juleps that lentulusgracchus is so fond of!
In Florida, it's really spotty - I can get sweet tea at most places. Quite a few of them have the carbonated stuff from a fountain that tastes like fruit punch. Some of waitresses think sweet tea means flavored tea, like rasberry!