European Union By vamanwani Jan 1, 1958 Belgium, France, Germany, Italy, Luxemburg and the Netherlands created the European Union. Jan 1, 1973 Denmark, Ireland and the United Kingdom joined the European Union. Jan 1, 1981 Greece joined the European Union. Jan 1, 1986 Portugal and Spain joined the European Union. Jan 1, 1995 Austria, Finland and Sweeden joined the European Union. Jan 1, 1999 Luxemburgo, Ireland, Italy, Finland, Germany, France, Portugal, Netherland, Austria & Belgium adopted the Euro. Jan 1, 2002 Greece and Spain adopted the Euro. 2004 Estonia joined the European Union. Jan 5, 2004 Cyprus, Czechia, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovania joined the European Union. Jan 1, 2007 Bulgaria and Romania joined the European Union. Jan 1, 2007 Slovenia adopted the Euro. Jan 1, 2008 Cyprus adopted the Euro. Jan 1, 2008 Malta adopted the Euro. Jan 1, 2009 Slovakia adopted the Euro. Jan 1, 2011 Estonia adopted the Euro. Jan 7, 2013 Croatia joined the European Union. Jan 1, 2014 Latvia adopted the Euro. Jan 1, 2015 Lithuania adopted the Euro.