Uhh.... Well, all I can say is I copied the list directly from the Southern Regionals website. I seem to remember years ago the U-19's competed on a different schedule, maybe that's it?

EDIT: I went back and checked the team listing and most states list U-19 teams but some states had some vacancies, one state didn't have any teams listed, so, possibly, there's a paperwork issue. On the brackets page, there's a spot for both boys and girls U-19's from SC.