2007 enlargement of the European Union
The 2007 enlargement of the European Union joined Bulgaria and Romania to the European Union. It happened on 1 January 2007. The Treaty of Accession was signed on April 25, 2005 at Luxembourg, Neumünster Abbey. It was the seventh time the Union accepted new members.
- Chronology of the Fifth EU Enlargement, Foreign and Commonwealth Office of the United Kingdom
- Melanie H. Ram, Ph.D., Sub-regional Cooperation and European Integration: Romania’s Delicate Balance