The objective of this thesis is to achieve a geopolitical analysis of the military operations undertaken in the first mandate of George Walker Bush government immediately after the terrorist attacks on september 11th, 2001.It is understood that the strategies adopted in those events were a result of the document Defense Planning Guidance by Pentagon in 1992, right after the end of the cold war.The hypothesis we intend to defend is that the geopolitical formulations that orientate the Truman Doctrine.In the period of the cold war are present in this document and were maintained as guides for action plans during all the decade of 90 and used as analytical tools in the great strategy of George Walker Bush government.In order to demonstrate this hypothesis, first of all we performed the redemption of the geopolitical thought of Halford J. Mackinder and Nicholas J. Spykman, followed by connections of the strategical existing ideas in several documents which were in effect in the decade of 90 and we finally verified how those ideas could be implemented in Operation Enduring Freedom in the Afghanistan war in 2001; and Operation Iraq Freedom in the war of Iraq in 2003.