Blame the comic book. Cheap and transportable, a trove of infantile fantasy and psychosexual Pop Art, often spiced with egregious stereotypes and nativist aggression, this humble medium was for a time the United States’ most ubiquitous cultural ambassador. Such is the thesis of Paul S. Hirsch’s Pulp Empire: The Secret History of Comic Book Imperialism, an engaging account of the ways in which comics variously served or confounded official interests. Vividly illustrated and enjoyably hyperbolic, Pulp Empire tells its tale as a kind of horror comic. Recounting the emergence of comic books during the Depression, Hirsch details how the medium