Shortly after H.G. Wells published War of the Worlds, in which Martians decimate humanity, an American author countered with a buoyantly optimistic sequel, Edison's Conquest of Mars--the great Thomas Edison invents a disintegrator beam which exterminates the aliens and unifies Earth behind America. This may seem a harmless fantasy, but as H. Bruce Franklin points out in War Stars, an eye-opening analysis of the superweapon in American culture, Edison's...