The EU By Samuele Salvadori 1952 European Coal and Steel community 1957 European economic community Treaty of Rome 1973 Denmark, Ireland and UK joined the EU 1981 Greece joined EU 1986 Spain and Portugal joined EU 1989 Fall of Berlin wall 1993 Treaty of Maastricht established the EU 2002 The Euro enter into force 2007 Treaty of Lisbon The most recently 2013 Croatia joined EU 2015 Members countries becomes 28 2016 Brexit referendum in the UK 2020 UK leave the EU
