Both the phenomenon of terrorism and our conception of it depend on historical context—political, social, and economic—and how the countries, groups and individuals who participate in or respond to the actions we call terrorism related to the world in which they act. The causes and effects of terrorism are comprehensible only in terms of political conflicts in specific historical periods. The current gap between Latin America and the United States on the conception of terrorism and the policy guidance that will establish a common anti-terrorist strategy in the Western Hemisphere respond to the unpredictability and dynamic of this phenomenon. Therefore, in order to reduce this present gap we require an effective guide to anti-terrorist policy formulation in Latin America and the United States under a common, clear, and prospective strategy that will be able to establish, enforce, and continually refine a holistic political-military plan and generate consistent national and international support.