From its much-debated origins in nineteenth-century California; through its popularity among the smart set of the 1930s, world leaders of the 1940s, and the men in the gray flannel suits of the 1950s; to its resurgence among today's retro-hipsters: Lowell Edmunds traces the history and cultural significance of the cocktail H.L. Mencken called the only American invention as perfect as a sonnet.