When I first started teaching in the late 60s and early 70s in the South, I found that some of my female students (age 18+) talked about their debutante balls and coming out parties. I don’t know if that is still common. But in the Hispanic community the quinceañera is similar. Cubans in Miami make a big deal out of it and try to outdo one another with how lavish they are.
The Quinceanera is more like a HUGE birthday party and celebrates girls turning 15. They have them in Florida and Texas...perhaps in other places too.
Deb Balls are to introduce upper middle to extremely wealthy young women to society and has nothing at all to do with anyone's birthday.
My college roommate and her younger sister had debut balls. This was in the mid-80s. I found the dressmaker who made my wedding dress (she also owned a taco shop) because she made the dress my roommate wore to her sister’s party.
Hispanics in San Antonio do the same thing. I saw one where they rented the entire Convention Center.