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.
Chicagoland: They ask what kind. Iced tea is a thing, so are different kinds of hot tea. Some places have bottled brands, depending on the place. It’s not all that complicated.
Same in my area.