This thesis addresses indigenous groups agency in trade governance to enhance their ability to affect international decision-making that benefits their capability to sustainable development. It conducts a case study of Articulation of Indigenous People Brazil (APIB) in the EU-Mercosur Agreement and utilizes Eimers (2020) theory of subaltern social movement theory to establish: what strategies the APIB have used in the decision-making processes of the “Mercosur Agreement?  This theory allows consideration of indigenous agency and the effect of post-colonial structures on their capability to keep control over their realties. To collect data on this topic the author uses qualitative semi-structured interviews and qualitative thematic text analysis. The thesis finds that framing strategies of claims enabled alliance-building in Brazil and Transnational Advocacy Coalitions, which used international norms to enhance indigenous interests. However, has post-colonial structures hindered APIB´s ability to enhance interest in Brazil and silenced indigenous interests in governmental representation in the making of the EU-Mercosur.