This paper is a continuation of the scientific literature dealing with the politico-linguistic divisions of Belgian national territory. Through a diachronic analysis, it aims at analysing its most recent developments. A fieldwork, combined with the analysis of official directives from the Flemish authorities and the processing of sociolinguistic data previously collected, provide information on the new forms of politico-linguistic divisions in the Flemish periphery of Brussels-Capital (a cosmopolitan capital). This article assumes an ongoing process of national autonomy through more or less informal territorial demarcation strategies displayed by the Flemish authorities. Semi-structured interviews with elected officials, residents, cultural associations (mostly French-speaking ones) and civil servants from this Flemish periphery show that these strategies are always based on the minimisation of the existing Francophone community. If the Dutch-speaking / French-speaking dichotomy seems obsolete for such an internationalised periphery, and thus refers to worn-out linguistic battles in Belgium, the French-speaking national minority factually remains the most demanding and resistant to new Flemish territorial delimitation strategies. Furthermore, the internationalisation of the periphery reinforces the ever-increasing phenomenon of its francisation (following the model of the federal capital). In words, this French-speaking population denounces informal division manoeuvres that began in the 1970’s, during municipal merging operations. The analysis of sociolinguistic indicators made it possible to test these accusations of gerrymandering. If the clearly intentional dimension of these strategies, with regard to the marginalization of the Francophone community in the periphery, remains difficult to demonstrate, it seems certain that the most urbanised municipalities (and those gathering large French-speaking minorities) were not merged with each other but with more rural, more Dutch-speaking, municipalities, not ...