As someone who moved between states with very different ideologies half way through high-school and got to observe the curriculum differences I agree that there

As someone who moved between states with very different ideologies half way through high-school and got to observe the curriculum differences I agree that there is an ideological component to curriculum selection but I wouldn't call it an active battle, just a reflection of the values of the people choosing the curriculum. I assume that in both states the committees that set curriculum are well meaning but small bias over time has a cumulative effect if not controlled for and they probably don't have the political capital to include good coverage of things that are inconvenient for the prevailing ideology. I wasn't ever taught "wrong" but coverage of subject areas that would cause students to ask questions that would be tough for people of the majority ideology to answer was certainly lacking. I hope the purple states are at least a little better since they should have a critical mass of people of the other ideology that keep things from going too far in either direction over time. Edit: And this was in the late '00s, before things became as polarized as they are.