In the South East, they bring you sweetened (usually far too sweetened for my tastes) iced tea. This is amazingly universal.
I live in NC and have been probing the border for years.
For “nicer” restaurants, the universal sweet tea boundary seems to be precisely at the NC/VA border.
Because you are doing it wrong. Tea is a hot beverage and iced tea is an affront to god.
In the southern US where iced tea really took off, summer temps are typically over 35°. I’m not drinking hot anything in that weather.
coward