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.
Southern US — get black tea, iced. Sometimes asked for sweeter preference.
Hot tea is never on the menu, except for tea houses.