I read one account that it started back as far as the 1830-1850’s when the socialist/libs (whatever) started their infiltration of schools which morphed in to the public school system.
I am not against the concept of being taught in a public school, what I am against is how the schools are funded, manned and directed.
Teaching people to write doesn’t have to be political.
Teaching people math doesn’t have to be ideological.
Teaching people to read doesn’t have to be ideological AND political.
But that is what public education became...public indoctrination. Liberals simply could not resist doing it.
Liberals recognized early on that getting their hooks into public education was the best way to attempt to achieve a utopian society.