I seem to find myself recommending Gatto's The Underground History of American Education on a reasonably regular basis, and indeed here I am doing it again. The Internet Archive has it in various formats at https://archive.org/details/TheUndergroundHistoryOfAmericanE.... While its conclusions are far from incontrovertible, the author does a good job of sourcing and supporting his argument, and I think you might find it worth your while.