Geopolitics as a multidisciplinary branch of social science and as a theory of foreign policy appeared on the Latin-American continent in the second half of the 1920s. The main features they include are the next: aggressive approach to the space, the continental adaption of the organic state-theory elaborated by Ratzel and Kjellen, moreover, the developed geopolitical theory was thought to be converted into practice via the growing role of the army. The armed forces and their various institutions became the scientific centre of elaborating the new attitude to the international relations as a theory. When the army assumed the political power, however, it was given an opportunity to put these theories into practice. On the Latin-American continent the geopolitical schools with important theoretical background were established in Argentina, Brazil and Chile. In this study we introduce the Brazilian geopolitical theory and practice elaborated in the Supreme Military Academy and the Chilean geopolitical theory and practice established by generals Ramon Cañas Montalva and Augusto Pinochet.