Among his other accomplishments, Donald Trump, without ever intending to, has fractured conservatism – something that was long overdue. The American conservative movement has come quite a distance since the middle of the last century, from a small coterie viewed with contempt by the larger culture to the front ranks of a juggernaut that set back the plans of this country’s left-wing collectivists to a degree that its founders would not have considered possible. (Recall William F. Buckley’s statement that the role of conservatism was to “stand athwart history, yelling “stop.” Incredible as it may seem, “history” did stop.) Today,...