Scholarly attention to the processes of globalization and the construction of regional blocs such as the European Union, NAFTA, and Mercosur has resulted in the relatively widespread belief that borders are in the process of disappearing. Yet, ethnographic studies on political borders have for several years been evincing various redefinitions of border areas comprising new conflicts and mechanisms for strengthening certain barriers between countries. This article attempts to contribute to the discussion of the interplay between nation, state, and border in the Mercosur by analyzing transformations on the Argentinian-Brazilian border. My particular interest is in examining how sociocultural conflicts and negotiations at borders in this region are affecting the construction of new meanings of nationality, and conversely, how new policies (especially "hygienic" barriers) being defined from the politico-economic centers are transforming local populations' everyday lives and experiences. Border populations can be as important in the construction of state and nation as are areas deemed to be central.
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