USH in this country does not go deep by design, because the purpose isn't to educate, it's to mold compliant citizens. The problem goes all the way up to college, and so it's evident in AP classes, too. This explains why so many highly-educated public figures can expound on the Founding Fathers, get it consistently wrong, and nobody calls them out on it.
You sometimes accuse others of politicizing threads, but that is what you are doing here. I could offer my own political critique of what is taught in U.S. history, which is the opposite of your complaint, but it would also be off-topic.
