The chapter starts with an overview of the rise of modern development politics, showing how it was a manifestation of post-imperial sovereignty in a world order constructed by Britain, America, and other developed capitalist nations. It emphasizes the challenge of sovereignty and nationalism for post-colonial governance. It highlights the historical features of urgency, insecurity, and nationalism for post-colonial developmentalism. It then offers a treatment of Japan as a post-imperial developer. Commencing with the establishing of a national economy in the late 1700s, the chapter focuses on the Meiji politics of national development through imperialism and support for large companies. It focuses on the post-Second World War recovery and sustained transformation. It reviews the role of the state, the insecurities of post-war governance, the national vision of business, and the role of America. The chapter outlines the mass social improvements that resulted from capitalist transformation.