I’ve always had to specify whether I wanted sweet or unsweetened, or they leave it unsweetened but have packets on the table, I’m in North Texas/DFW.
Dallas was the only place I ever drank unsweetened tea on a regular basis.
When I was at SMU, they never told me where they kept the sugar in the cafeteria, so I did without for two whole semesters and thought I had really “come of age.”
Look at me, I’m drinking no-sugar tea! (Then I found it the next year.)