Book excerpt: Tracing the reciprocal relationship between Africa and North America from the seventeenth-century slave trade onwards, two leading authorities in the field provide a major revision to traditional colonial African history as well as to US history. Departing from prior accounts that tended to emphasise only the role of the colonial metropoles in developing Africa, the authors show how American pioneers - missionaries, traders, prospectors, miners, engineers, scientists, and others - have helped to shape Africa. They also point to the equally important impact made by Africa on the United States through trade and immigration, and through the influence of Africans on the arts and agriculture, among other facets of American life. In a study of exceptionally broad scope, the authors devote particular attention to the development of United States policy regarding Africa, the impact of private enterprise, the operation of governmental lobbies, the administration of foreign aid, and the involvement of Africa in the Cold War.