United States of Europe

The United States of Europe, the European state,  the European superstate, the European federation and Federal Europe are names used to refer to several similar hypothetical scenarios of the unification of Europe as a single sovereign federation of states (hence superstate), similar to the United States of America, both as projected by writers of speculative fiction and science fiction and by political scientists, politicians, geographers, historians and futurologists. At present, while the European Union (EU) is not officially a federation, various academic observers regard it as having the characteristics of a federal system.

Specifically, the term "United States of Europe" – as a direct comparison with the United States of America – would imply that all the European states would acquire a status similar to that of a U.S. state, becoming constituent parts of a European federation acting as one country.