EU By giulia cusano 1952 European Coal and Steel Community 1957 European Economic Community (Treaty of Rome) 1973 Denmark, Ireland, United Kingdom joined the EU 1981 Greece Join the UE 1989 the fall of the Berlin Wall 1992 single market became reality 1993 Treaty of Maastricht (birth of EU) 2002 the euro, single currency 2009 The Treaty of Lisbon becames law 2012 EU is awarded the Nobel Peace Prize 2013 Croatia is the latest member of the EU 2016 Brexit Referendum 2020 United Kingdom left the EU (Brexit)