This chapter is the second building bloc of a wider reconstruction of the main economic, (geo)political, and ideational forces that enabled European integration to take off as of the spring of 1950. It describes the practical unfolding of European integration after the Second World War. This part of the book tries to uncover deeper layers (of psychology and belief) in this history through three crucial sub-histories. This chapter deals with the second of these sub-histories. It traces how the coming about and the workings of the Marshall Plan gradually illuminated an institutional, economic, and political pathway for integration in Western Europe. This second sub-history shows how the gradual (self-)outmanoeuvring of the United Kingdom in matters of European cooperation happened to that country and the West, and how this worked as a catalyst for regional European integration and ‘the emergence of a continental West’.