Croatia Becomes Newest EU Member

Fireworks illuminate the sky over the border crossing between Croatia and Slovenia during celebrations of Croatia's EU accession, in Bregana, July 1, 2013.

A Croatian official unveils a new EU border sign at Bajakovo border crossing between Serbia and Croatia, July 1, 2013.

A Croatian police office and a customs officer raise a European Union flag at the border crossing between Croatia and Slovenia during celebrations marking Croatia's EU accession, in Bregana, July 1, 2013.

A woman makes victory sign as she holds the EU flag during the celebration of the accession of Croatia to the European Union in Zagreb, June 30, 2013.