This chapter explores how the conceptual shift from ‘tribes’ to ‘ethnic groups’ contributed to the dismantling of the standard of civilisation. Whereas the binary distinction between civilised nations and primitive tribes reinforced the imperial hierarchy between European and non-European peoples, the concept of ethnicity is characterised by a cultural relativism that acknowledges the formal equality of all peoples. The chapter also shows how these conceptual changes enabled the reimagining of the international order as an ‘anarchical’ system populated by sovereign nation-states: at the very moment that anthropologists were moving away from colonial notions of ‘primitive society’ and ‘ordered anarchy’, IR theorists were adopting this vocabulary to conceptualise their own object. In this way, IR effectively accumulated the functions of colonial anthropology as the scientific vehicle for the study of the modern state’s primitive ‘other’. The chapter wraps up with a discussion of indigenous rights and their relationship to minority rights.