That’s sad, in my elementary school we learned square dancing, but also the Mexican Hat Dance and Tinikling and the Polka, I can’t remember if there were others since it was back in the 1960s. I think learning the Charleston would have been fun! When I taught 2nd grade, dance wasn’t part of PE but for a countries around the world assembly I taught my class some Russian (and, now I know better, some of it was Ukrainian) folk dances I had learned from my Russian ballet teacher. They got a kick out of it.