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.
Netherlands. You’d get a glass or cup of hot water, and a box of tea bags to select from. If you want ice tea, you explicitly have to call that out. Just “tea” refers to the hot (original) version without sugar.
Same in Hungary.