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.
In Spain they will immediatelly ask you if you are sick. Only sick people drink tea there, or english tourists, but they will usually go to english bars anyway. In those places they will serve black tea and ask you if you want it with lemon or milk.
Now that is interesting.
Wow that is not true at all.
I’m happy to get conviced otherwise but in my 26 years living in Spain, Valencia and Andalucia, that was what I have experienced.