Moravcsik's liberal intergovernmentalism irrevocably upgraded the rigour of European Union scholarship by categorizing the EU as an international organization, and analyzing it in terms of general theories of international relations. The deepening of European governance has meant, however, that the EU today is better understood as a polity in formation, generalizable through the lens of comparative politics instead of international relations. Alongside the burgeoning literature on the EU's politicization, I advocate for comparisons to historical episodes of state‐building and nationalism, with particular attention to the role of culture and identity in shoring up, or contesting, political authority. Doing so allows us to better delineate the challenges presented by European citizens’ lack of impassioned attachment to the EU, while also informing a broader understanding of the populist backlashes occurring in the context of more global trends of transnational authority construction.