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.
Here in Estonia you’ll get asked what kind of tea (black, green etc) you want (restaurants here usually have several kinds of it). It’s assumed you want hot tea unless you specifically ask for iced.