My parents must have known what was going on, because at great sacrifice to their limited and meager finances, they managed to put me and my siblings through parochial school, where proper history was taught. This was in the late 60s early 70s.
Looking back, though, I remember some of the PC bullhs*t starting to creep into that system as well.
That and homeschooling are the only ways that parents can keep their children from experiencing the brainwashing that takes place in the public schools.