`titre traitementparticulier="non"bAbstract`/titreb This article offe rs a critical view of the process of material constitutionalization of the European citizenship, through an analysis of the transformations of its outer borders in the phase of enlargement.The repositioning and deterritorialization of the inner and outer borders of the EU lead to a decomposition of its judiciary space, which illustrates the way in which borders have become an instrument of governance of Europe’s postcolonial condition. The analysis focuses on the recent legislative tra n s form ations introduced in Poland, Romania and Bulga ria in order to adapt their national judicial systems to EU common rules.