2004.
Ten countries joined the European Union in 2004.
2007.
1995.
2004
May 2004.
Croatia joined the European Union on the 1st of July 2013.
Sofia is the capital city of Bulgaria. Countries, not cities, join the European Union. Bulgaria joined in 2007.
European Union Membership Additions in 1995:AustriaFinlandSweden
On the 1st of May 2004, the Greek part of Cyprus joined the European Union.
Turkeyâ??s progress to join European Union has been quite slow, since there is opposition from some EU countries over Turkeyâ??s membership. It is now over half a decade of Turkeyâ??s struggle to join the union.
1st May 2004
Slovenia joined the European Union on the 1st of May 2004.