Everyone is very focused on recent history. What about the huge amounts of aging immigrants in the USA that migrated here for a better life in the 50s-70s from poor countries and no education? They just worked their ass off and reading wasn’t a priority. My father was a poor shepard, no education and illiterate but he hustled and retired early and put me through college to be an engineer. It seems improbable but it is possible for someone to be illiterate and wildly successful and contribute a lot to society and culture.