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.
Can confirm for Switzerland. It’ll probably be some crappy tea bag quality, like lipton yellow or Twinings. They’ll also probably charge you 4-6 CHF (about the same in USD) for it.