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Schengen Area
  The Schengen Area
  EU member states that are obliged to join the area
  Countries with open borders
 
European Economic Area
  European Union (without Croatia)
  Iceland, Norway (without Svalbard) and Liechtenstein

The United States of Europe (USE), the European State, the European Federation and Federal Europe, is the hypothetical scenario of the European integration leading to formation of a sovereign superstate (similar to the United States of America), organised as a federation of the member countries of the European Union (EU), as contemplated by political scientists, politicians, geographers, historians, futurologists and fiction writers. At present, while the EU is not a federation, various academic observers regard it as having some of the characteristics of a federal system.

History