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’m from Ireland. Asking for tea in a restaurant will usually get you a cup of English breakfast tea or an Irish variant of from a brand like Lyons, Barry’s, Bewley’s, or Fallon’s. Its a slightly different flavor to typical English breakfast tea, sometimes called Irish breakfast tea.
You would usually get a small pot of hot tea, with a cup, a small jug of milk and some sachets of sugar. Most people take milk and the equivalent of 2 tea spoons of sugar.
Sometimes I prefer coffee, but if I dont feel well or am stressed, I tend to reach for this kind of tea since that’s what I grew up with.