In this work the authors analyse the phenomenon of migration, and the recognition and validity of the human right to migrate, in connection with the three aspects mentioned in the title: the theory and the world of life; extending the notion of citizenship; and the possible relations between a broader treatment of citizenship and the political participation of migrants, resulting in the notion of "emerging intercultural citizenships". The theoretical and epistemological developments are applied to an analysis of the process occurring in the Province of Rio Negro (Patagonia, Argentina), in which typical confl icts of "cultural frontiers" are interwoven with those originating in the reactions of white minorities transplanted before the irruption on the public scene of communities of immigrant origin. This contraposition between the lines of approach proposed and a typical example serves to underline the profundity of the cleavage between cultures and the need for an intercultural perspective rooted in the world of life, in order to be able both to make a strict theoretical analysis of this dimension of the confl ict, and to draw up proposals with the aim of producing changes in social imaginaries and public policies.