I have written repeatedly about the hard-left bias in the teaching of AP American History. I finally got tired of writing such posts and abandoned the beat. But now, I learn that, beginning in 2020, many Advanced Placement students will be using an American History textbook that suggests President Trump is mentally ill and that depicts him and many of his supporters as racists. The book asserts that “[Trump’s] not very-hidden racism connected with a significant number of primary voters.” What connected with a significant number of primary voters was Trump’s strong opposition to illegal immigration and his concern over...