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.