The World Bank , controlled by its United States and European majority , helps trap Africa in its low-growth role as exporter of raw materials , and the worst poverty is found in refugee camps created by civil wars against thugs who were armed and aided in return for cooperating with American military , covert and mineral operations : Savimbi in Angola , Mobutu in the Congo , Doe in Liberia , Barre in Somalia and Nimeiry in the Sudan .