The idea of an autocratic regime ruling America has long been a preoccupation of alternate-history enthusiasts and sci-fi authors. With Donald Trump now in office, those fictions suddenly seem all too real. (The Republican National Convention, at which Trump bellowed "I am your voice," and insisted that he alone can fix the nation's problems, was like a scary set piece from a dystopian novel.) In 2015, Amazon began streaming a slick TV adaptation of one of this genre's best books, Philip K. Dick's