Which countries belong to the EU?
The EU has grown steadily from its six founding members to 28 countries. Belgium, France, Germany, Italy, Luxembourg and the Netherlands signed up to the EEC, or Common Market in 1957. Britain, Ireland and Denmark joined in the first wave of expansion in 1973, followed by Greece in 1981 and Portugal and Spain five years later. Eastern Germany joined after unification and Austria, Finland and Sweden became part of the EU in 1995. The biggest enlargement came in 2004 when 10 new member countries joined. Romania and Bulgaria joined in 2007 and Croatia was latest to sign up in 2013.