Since 1945, violent conflict has occurred primarily within sovereign states rather than among them. These internal conflicts have far surpassed international conflicts in lethality, economic destruction, and social upheaval. This phenomenon is diverse: no region has avoided civil wars, while the stated aims of rebel groups have ranged widely. Prominent examples include anti-colonial nationalists in Algeria, Mozambique, and Kenya; ethnic separatists in Eritrea and Bosnia; leftists in Latin America and Southeastern Asia; Islamic fundamentalists in Afghanistan, Iraq, and Syria; and income seeking warlords in Liberia and Sierra Leone. Internal conflicts have emerged in rich European countries such as the United Kingdom and Spain, and in the con...