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EU-25

Referendum results
77.3 / 100
66.8 / 100
83.8 / 100
67.5 / 100
91.1 / 100
53.6 / 100
77.6 / 100
93.7 / 100
89.6 / 100

The 2004 enlargement of the European Union was the largest single expansion of the European Union (EU), in terms of territory, number of states, and population to date; however, it was not the largest in terms of gross domestic product. It occurred on 1 May 2004.

The simultaneous accessions concerned the following countries, sometimes referred to as the "A10" countries: Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia. Seven of these were part of the former Eastern Bloc (of which three were from the former Soviet Union and four were and still are members of the Central European alliance Visegrád Group), one of the former Yugoslavia (together sometimes referred to as the "A8" countries), and the remaining two were Mediterranean islands and former British colonies.

Part of the same wave of enlargement was the accession of Bulgaria and Romania in 2007, who were unable to join in 2004, but, according to the Commission, constitute part of the fifth enlargement.

With the end of the Second World War in 1945, Europe found itself divided between a capitalist Western Bloc and a communist Eastern Bloc, as well as Third World neutral countries. The European Economic Community (EEC) was created in 1957 between six countries within the Western Bloc and later expanded to twelve countries across Europe. European communist countries had a looser economic grouping with the USSR known as Comecon. To the south there was a non-aligned communist federated country - Yugoslavia.


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