In previous generations, history courses used to teach how England's spiritual awakening near the height of its empire led to the abolitionist movement, not just for the English homeland but to all it controlled and even to much of the rest of the world that had to deal with England. Today's history courses blame the Anglos for slavery, though the Anglos are most responsible for ridding most of the world of slavery.
I think this is basically the nut of the problem. People look at the course titles in the History Department, and it’s all either interest group angles on why Western Civilization is BAD, or abstract Frankfurt School navel gazing that is of no interest to anyone who’s not insane.