There were four 5th grade teachers in my grade school, and my 5th grade teacher was the only one who taught square dancing. We didn't do square dancing in PE; we did it as a part of our scholastic curriculum. All year long. No one else. Just us.

Were you in Illinois or where? Come to think of it I think my 5th grade teacher (around 1985) also taught a bit of square dancing as part of social studies or something.