In 1882, the assassination of Lord Frederick Cavendish and Thomas Burke, his Undersecretary, in Phoenix Park, Dublin, was presented in the British press as the action of an oversized, murderous, and uncontrollable Frankenstein’s monster. In the last phases of World War II, the Japanese people were portrayed in the United States as a swarm of mouse-toothed, pest–human hybrids that deserved to be exterminated. In cartoons published in the aftermath of the September 11 attacks, a many-headed hydra representing “terrorist states” had one head—“Al-Qaida”—severed, while two newer snake-heads sprouted in its place and others, including those named “Hamas,” “Hezbollah,” and “al-Jihad,” lurked in the shadow waiting for their turn to strike Uncle Sam....