European Union: History

1951 Germany, France, Italy, the Netherlands, Belgium, and Luxembourg sign the Coal and Steel treaty to manage heavy industries together.
Coal and Steel Treaty members sign the Treaty of Rome, which leads to the creation of a “common market” under the European Economic Community (EEC). 1957
1965 The Brussels Treaty merges leadership positions within the three separate organizations into one large body known as the Council of Ministers.
The first enlargement of the EC took place with the addition of Denmark, Ireland, and the United Kingdom. 1973
1974 The European Council is established to specifically set long-term agendas for political and economic integration.
Europeans elect European Parliament members for the first time. 1979
1987 Single European Act (SEA) comes into enforcement, expanding common market flexibility.
The Maastricht Treaty is signed, which established rules of common currency in addition to providing further coordination for foreign and security policy. The European Community formally changes its name to the European Union. 1992
1998 A new currency, the euro, was launched in world money markets. It became the unit of exchange for all of the EU states except the United Kingdom, Sweden, and Denmark.
Treaty of Nice entered into force to set forth rules streamlining the size and procedures of EU institutions. 2003
2004 Ten new countries joined the EU, and the European constitution is signed by all 25 EU countries. Ratification failed in 2005.
Bulgaria and Romania join the EU, bringing membership to 27 countries. 2007
2009 Treaty of Lisbon entered into force to provide EU with modern institutions to address issues such as globalization, climate change, security, and energy.
At a European Council meeting in Brussels, EU leaders adopt a 10-year strategy for smart, sustainable and inclusive growth: Europe 2020. They also decide to open accession negotiations with Iceland. 2010
2013 Croatia becomes the 28th country to join the European Union.
The European Union enforces economic sanctions against Russia in response to Russia's "illegal annexation of Crimea and deliberate destabilization of a neighboring sovereign country". 2014

Sources

Ellicott, Karen. "European Union." Countries of the World and Their Leaders Yearbook 2007. Farmington Hills, MI: Thomson Gale, 2006. 2077-082.

Official European Union Website: The History of the European Union

Glossary