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Three pillars of the European Union
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Legal structure of the European Union from 1993 to 2009
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Wikipedia

Between 1993 and 2009, the European Union (EU) legally comprised three pillars. This structure was introduced with the Maastricht Treaty on 1 November 1993, and was eventually abandoned on 1 December 2009 upon the entry into force of the Treaty of Lisbon, when the EU obtained a consolidated legal personality and a structured distribution of...

Instance of
triad
References
Wikidata