I'm mean, I definitely learned some of this in high school. Yet I know people who went to the same school who believe completely different things than me. Despite learning the history of native Americans, black Americans, etc. It's almost like there are also other things at play... News media, social media, culture, family, lived experience, etc. Those thing also impact what people will believe. It's not like kids go to school and just believe everything they're told. Yes many schools didn't teach this, many schools did, it's not really the whole picture though.