The European Union was formally established(with the Maastricht Treaty) The European Union was formally a day that many people on November 1, 1993. However, January 1, 2002, is It was also the start of remember. It wasn't just the start of another new year. countries. On that a new era for the 304 million people Jiving in 12 European The European day, the euro became the official cy of their countries. to join Union currently has 27 member states, and new members are expected any of Citizens of member countries can travel freely, live, study, and work in the member countries.