Failed states-states in which government authority has collapsed, violence has become endemic, and functional governance has ceased-have emerged in the period since the end of the Cold War as one of the most difficult challenges confronting the international community, especially in the region of Sub-Saharan Africa. Transnational terrorist groups use the chaos of failed states to shield themselves from effective counterterrorism efforts by the international community. The potential nexus of failed state-based terrorism and terrorists' access to Weapons of Mass Destruction (WMD), especially nuclear WMD, escalates the risk that such groups pose to the United States and to its allies in the Global War on Terror. In this monograph, the author finds that current counterterrorism strategies have yielded limited results in addressing the threat posed by terrorist groups operating in and from failed states. He argues that the uniquely challenging conditions in such states require a new approach to counterterrorism.