Yes true, and yet still I believe there has traditionally been a bias in western primary education to hold out ancient Greece and Rome as the inspiration and touch stone for western civilization.
Our architecture itself makes that case. Our public buildings, our great memorials built largely in the Greco-Roman style is a very public statement about what we consider to be our heritage, our touch stone.
My recollection is that very little effort was ever made in public education to make a more a more realistic and holistic presentation about the progression of human civilizations in southwest Asia, the eastern Mediterranian and northwest Africa, and the influences that ultimately manifested later on in the Greco-Roman worlds.