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.
I still want to visit Hong Kong but don’t have the budget atm, and that first paragraph isn’t helping
Also, 鐵觀音 (Tie Guan Yin) is also my favourite tea, that’s a coincidence!