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.
India, You’ll get properly boiled tea with milk (chai) unless you specifically ask for black/ red tea which you’ll only get in Kerala (called black/kattan ) & in our NorthEastern states (called red tea/lal cha).
The 2nd best way to piss off an Indian is to serve tea brewed with teabags, the best to upset us is to serve tea brewed using teabags and using powdered milk.
We like our tea to be boiled with milk, water, spices, and sugar/jaggery. If you want to make our day, boil the tea with condensed milk, water, and spices and watch us beam. The spices will always be fresh and any combo of sweet cardamom, ginger, cloves, star anise, pinch of cinnamon, lemongrass,