In 1770 a handful of European nations ruled the Americas, drawing from them a stream of products, both everyday and exotic. Some two and a half million black slaves, imprisoned in plantation colonies, toiled to produce the sugar, coffee, cotton, ginger and indigo craved by Europeans. By 1848 the major systems of colonial slavery had been swept away either by independence movements, slave revolts, abolitionists or some combination of all three. How did this happen? Robin Blackburn’s history captures the complexity of a revolutionary age in a compelling narrative. In some cases colonial rule fell while slavery flourished, as happened in the South of the United States and in Brazil; elsewhere slavery ended but colonial rule remained, as in the British West Indies and French Windwards. But in