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.
Dim sum restaurant will ask you what kind
Pu-er, iron goddess, chrysanthemum, oolong, saumei, etc.