<Online Only>This book recounts the transformation of Europe from the interwar era until the euro crisis, using the tools of constitutional analysis and critical theory. The central claim is twofold: post-war Europe is reconstituted in a manner combining political authoritarianism and economic liberalism, producing an order which is now in a critical condition. The book begins in the interwar era, when liberalism, unable to deal with mass democracy and the social question, turns to authoritarianism in an attempt to suppress democracy, with disastrous consequences in Weimar and elsewhere. After the Second World War, partly on the basis of a very different diagnosis of interwar collapse, and initially through a passive authoritarianism, inter-state sovereignty is reconfigured, state-society relations are depoliticized, and social relations transformed. Integration is substituted for internationalism, technocracy for democracy, and economic liberty for political freedom and class struggle. This transformation takes time to unfold, and it presents continuities as well as discontinuities. It is deepened by the neo-liberalism of the Maastricht era and the creation of Economic and Monetary Union, and yet countermovements then also emerge: geopolitically, in the return of the German question; and domestically, in the challenges presented by constitutional courts and anti-systemic movements. Struggles over sovereignty, democracy, and political freedom resurface, but are then more actively repressed through the authoritarian liberalism of the euro crisis phase. This leads now to an impasse. Anti-systemic politics return but remain uneasily within the EU, suggesting that the post-war order of authoritarian liberalism is reaching its limits. As yet, however, there has been no definitive rupture.</Online Only>