It’s U.S. history. Sheesh!
I agree that it is history. History is not politically, culturally, or religiously neutral, and it is impossible to teach it in a religiously, politically, or culturally neutral manner.
It is best that government have nothing to do with teaching history or anything at all to children. It is best to privately decide these matters between the parents, and ( in a private setting of a private school) teachers, principals, and the board directors of the school.
Solution: Begin the process of privatizing universal K-12 schooling. Vouchers, tax credits, and charters might help in establishing the private infrastructure but the process must be continually in the direction of having families take full responsibility for educating their children.