This thesis analyzes the hegemony of the agribusiness sector and the disputes carried out by rural social movements - here defined as territories of resistance - in the formation of the Brazilian foreign policy in the period of the two Lula administrations (2003-2010), with an emphasis on agricultural negotiations in WTO, FTAA and the European Union-Mercosur agreement. In order to do so, it investigates how the Brazilian countryside, based on the persistence of large land ownership, went through an intense modernization and internationalization, forging the particular interests of agribusiness as a supposed unitary, homogeneous and conflict-free national interest, in an attempt to make invisible disputes, conflicts and struggles for land and territory that are part of the country’s history since the colonial period. Territories of resistance considered backward, residual and outside the system occupy about a third of the national territory and play a fundamental role in domestic food production and supply. Adopting the lens of Gramsci and of Decolonial authors - where rural social movements challenge the coloniality of the agro from their resistance in the territories and in the disputes for space in the sphere of the State - the thesis investigates how these resistances mobilize questions and challenges to some fundamental pillars of the International Relations discipline, especially the notions of national sovereignty, national interest and Nation States that relate with each other based on homogeneous national territories. The thesis investigates how these territories of resistance - and of future - indicate possibilities of thinking about new approaches regarding sovereignty and national interest, the role of the State as a driver of foreign policy and about new perspectives for the role of Brazil in the world.