Rum arguably shaped the modern world. It was to the eighteenth century what oil is to the present, but its significance has been diminished by a misguided sense of old-fashioned morality dating back to Prohibition. In fact, Rum shows that even the Puritans took a shot now and then. Rum, too, was one of the major engines of the American Revolution, a fact often missing from histories of the era. Ian Williams's book -- as biting and multilayered as...