Eurozone

The Eurozone or EZ was an Earth superpower which competed with the United States of America in the early 21st century. It was composed of 25 European countries, including the United Kingdom and France, but excluding Poland. It's form of currency was "euromarks" and it had a Space Agency. (PROSE: Trading Futures, AUDIO: The Feast of Axos)

At some point during the 21st century, the Eurozone closed its borders. (AUDIO: Hothouse)

Behind the scenes
In reality, the is the collection of European countries that have given up their currencies and adopted the Euro.