for people downvoting, the great "schooling of society" started in the 1940s-50s: https://ourworldindata.org/literacy https://ourworldindata.org/literacy till

for people downvoting, the great "schooling of society" started in the 1940s-50s: https://ourworldindata.org/literacy https://ourworldindata.org/literacy till then most people around the world didn't know how to read and write. my own eastern european country had an illiteracy rate of 95% in 1920.