In 1940, Japan was into its third year of war with China, and relations with the United States were deteriorating, but it was a heady time for the Japanese nonetheless. That year, the Japanese commemorated the 2,600th anniversary of the founding of the Empire of Japan. According to the imperial myth-history, Emperor Jimmu, descended from the Sun Goddess Amaterasu, established the "unbroken imperial line" in 660 BCE. In carefully choreographed...