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.
From merica, Pacific Northwest. My experience is hot you’ll get some hot water in a kettle with a box of various teas, or iced which is non sweetened, can add sugar if ya want. If I just said “tea”, they’d ask hot or iced. Id feel strange just saying “tea” without being more specific.