the EU By DanyDurso 1952 European coal and steel community 1957 The european economic community 1973 Denmark, United Kindom and Ireland joined in the EU 1981 Greece joined in the EU 1986 Spain and Portugal joined in the EU 1989 Fall of the Berlin Wall 1992 Single market became reality 1993 the Treaty of Maastricht 2002 the Euro came into force in 2004 25 states 2007 The treaty of Lisbon was signed in the portughese capital 2013 Croatia is the latest member 2015 formed by 28 states 2020 Brexit