This dissertation is about the creation of UNASUR from the perspective of Brazilian foreign policy and analyses the mechanisms of political and administrative coordination of domestic policies of the Brazilian federal government that are related to the achievement of the purposes of UNASUR. The axes of conflict in the international system, in the national system and in the conduct of foreign policy are related as conditioning of South American regional integration through UNASUR as public policy objective. The approach adopts the perspective of the formulator of public policy that, from a realistic point of view, identifies actors and interests, evaluates its power resources and capabilities, in particular of the Brazilian state, through the use of concepts of analysis and implementation of public policy, political science, international relations, economics, geopolitical and public administration. The focus is on the administrative dimension and its centrality to the success of regional integration, because there is a gap between the presidential priority given to South American integration in Brazilian foreign policy and the low profile of coordinating domestic policies to support the process. There is an important agenda in progress and administrative procedures are being improved, but are still insufficient to support the geopolitical project of establishing a pole of South American power.