"For most European capitalist states, the enslavement of Africans had served its purpose by the middle of the nineteenth century; but for those Africans who dealt in captives the abrupt termination of the trade at any given point was a crisis of the greatest magnitude. In many areas, major social changes had taken place to bring the particular regions effectively into the service of the European slave trade—one of the most significant being the rise of “domestic slavery” and various forms of class and caste subjugation. African rulers and traders who found their social existence threatened by the earliest legal edicts such as the 1807 British act against the trade in slaves found ways of making contact with Europeans who still wanted slaves."