Do you think maybe this has something to do with lack of mandated sexual education (other than thumping on abstinence)?

There's also Colordo's experience with IUDs: https://www.denverpost.com/2017/11/30/colorado-teen-pregnanc...

This is the kind of birth control that we as a people seem to want to ban, though: https://bust.com/feminism/14138-colorado-is-shutting-down-aw...