What occurred in 2004 that marked the end of the period known as the history of the European Union
History of the European Union (1993–2004): The history of the European Union between 1993 and 2004 was the period between its creation (replacing the European Economic Community) and the 2004 enlargement. Enlargement of the European Union: The process of expanding the European Union (EU) through the accession of new member states began with the Inner Six, who founded the European Economic Community (the EU's predecessor) in 1958, when the Treaty of Rome came into force.
The process of expanding the European Union