This special issue of the Financial History Review contributes to the vast literature on the political economy of monetary unions. Inspired by the recent events in Europe, it reaches back in history to consider an earlier experiment in forming a monetary (as well as economic and political) union. In this historical case the pivotal event was the ratification of the United States Constitution in 1788, two centuries before the Maastricht Treaty. Between formal independence in 1781 and the implementation of the Constitution reforms in 1789, the fledgling country was organised politically into a loose confederation of thirteen, virtually sovereign states. Despite the nominal powers granted to the national government under the Articles of Confederation, it lacked the direct means to collect taxes and to enforce its policies. Consequently, during this brief period, state governments could and did pursue their own economic and monetary policies.