The current U.S.war against international terrorism constitutes a superb scenario for the internationalization of the Colombian armed conflict, a strategy that the administration of President Uribe is advancing. The internationalization policy is an explicit and conscious decision to invite external actors—mainly the U.S.—to participate in the Colombian war.This decision is clearly conditioned by the international arena. Both rationalist and constructivist approaches in International Relations provide key elements to explain why the Colombian government decides to internationalize its conflict, and to identify what are the main components of this foreign policy strategy.