Compulsory public education in the United States
The movement for compulsory public education (in other words, prohibiting private schools and requiring all children to attend public schools) in the United States began in the early 1920s. It started with the Smith-Towner bill, a bill that would eventually establish the National Education Association and provide federal funds to public schools.
Source: Wikipedia — Compulsory public education in the United States (CC BY-SA 4.0)