.. because their teachers don't know Constitutional history.
Oklahoma study finding only 3% of high school students would pass U.S. Citizenship test and only 25% can name our first President.
I get my students who are mostly practicing teachers and always start from scratch because I feel like I need to. I think a lot of the 7th grade history class comes back to them as a teach about the legal framework of education, but it would certainly be interesting to give my teachers the U.S. citizenship test. I don't think they would fare much better than the students.
h/t @kyhistory