Nearly everything that has gone badly, deeply, terribly wrong in America’s present — if you’re reading this, you probably don’t need a list — can be found in America’s past. Your favorite truism about the power of history may apply here; mine comes courtesy of Salon contributor Mike Lofgren: “Those who fail to learn from history are doomed to repeat famous quotations.” I don’t mean that we are trapped in an inflexible pattern of endlessly repeating historical cycles, as in the more esoteric propositions of Vico and Nietzsche. (“Time is a flat circle,” as some lowlife says in the first...