This research deals with the issue of the Tri-border Area. By this term, I mean the political and historical dynamics directly or indirectly related to the alleged presence of international terrorism agents or theirs sponsors in the region where the borders of Brazil, Argentina and Paraguay meet. I focus my attention on the process of representation of this area as a potential source of threats to the security of the United States: in other words, I analyze the process of securitization of the Tri-border Area. After a brief introduction about this region and the methodological parameters that guide my research, I promote a dialogue between the Copenhagen School's Securitization Theory and the Critical Geopolitics literature as a way of thinking about the articulation of hegemonic discourses about the Triborder Area. Then I examine (1) U.S. Foreign Policy under George W. Bush, (2) the historical relationship between the United States and the phenomenon of political terrorism and, finally, (3) the ways in which Latin America has been present in security concern of the United States. Analyzing the discourses about the Tri- border Area I map the distinct historical periods related to the discursive representation of this space as a source of threat so that I can understand both the methods and that ways by which the Tri-border area has been included in the War on Terror.