EU By alessandro02 1957 is formed the european economic community 1973 Deenmark,UK and Ireland joined 1981 Grece joined to the EU 1986 Spain and Portugal joined toEU 1989 full of Berlin wall 2004 EU increase in size by 10 members and became 25 2007 Lisbon treaty 2013 Croatia joined and is delates member 2015 EU is formed by 26 members 2016 brexit referendum of the UK 2017 started the official process to withdraw from EU 2020 UK went out of members