Maastricht Treaty
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The Treaty on European Union, commonly known as the Maastricht Treaty, is the foundation treaty of the European Union. Wikipedia
Amendment: Edinburgh Agreement (1992); Treaty of Amsterdam (1999); Treaty of Nice (2003); Treaty of Lisbon (2009)
Effective: 1 November 1993
Location: Maastricht
Signed: 7 February 1992
Signatories: EU member states