The globalisation process brings about emerging territories which free themselves from the state or regional policies. The way these territories put on a performance, create themselves an image is essential as much for their legitimacy towards the populations as for the media coverage of their actions. The Greater Region, a cooperation space initiated by Europe, is a cosmopolitan territory looking for identity which, through the event called “Luxembourg and the Greater Region European culture capital 2007” tried to build itself, think itself and structure itself with a strategic identity aiming at an “identity victory”. This strategy had led to a series of coordinated actions whose aim was to create a common cultural policy of a cross-border emerging territory whose stakes, procedures and long-term effects are the object of study. From the enrolling of the network by central political authorities to the differentiated mobilizing of the entities of the Greater Region, including the analysis of the imagined cross-border cultural audiences and externalizing the settlement of the communicational package towards the communication agencies, we apprehend the integration of alterity in a common project through its communicational presence by analyzing the controversies inside this network. The study of how to make the event “Luxembourg and the Greater Region European culture capital 2007” durable through the structure called Cultural Space Greater Region enables to understand how interaction contexts stabilize and to think about the new approaches to the integration of alterity in a common project by using the notion of “coopetition”. At a time when the conception of alterity and its integration inside collective imagination are vital stakes, this analysis offers to understand the actions of identity co-building inside a territory marked by physical and imagined borders and by power struggles which derive from it. ; Le processus de mondialisation crée dans son sillage des territoires émergents s’affranchissant des ...