Politics · December 13, 2007

Treaty of Lisbon

18 years ago · Lisbon, Portugal

18th anniversary

The Treaty of Lisbon (initially known as the Reform Treaty) is a European agreement that amends the two treaties which form the constitutional basis of the European Union (EU). The Treaty of Lisbon, which was signed by all EU member states on 13 December 2007, entered into force on 1 December 2009.

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The 19th anniversary falls on December 13, 2026.

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