From the Summary: "On May 1, 2004, 10 states joined the European Union (EU), enlarging the Union to 25 members. The EU views the enlargement process as a historic opportunity to promote stability and prosperity in Europe. In addition to the 10 new members (Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia), Bulgaria and Romania hope to accede to the EU in 2007. Turkey and Croatia began accession negotiations in October 2005. Macedonia was named as a candidate for EU membership in December 2005. This report will be updated as necessary. For additional information, see CRS [Congressional Research Service] Report RS21372, 'The European Union: Questions and Answers', by Kristin Archick, and CRS Report RL32071, 'Turkey: Update on Selected Issues', by Carol Migdalovitz."
CRS Report for Congress, RS21344