Template:Structural evolution of the European Union
Since the end of World War II, sovereign European countries have entered into treaties and thereby co-operated and harmonised policies (or pooled sovereignty) in an increasing number of areas, in the so-called European integration project or the construction of Europe (Template:Lang-fr). The following timeline outlines the legal inception of the European Union (EU) ― the principal framework for this unification. The EU inherited many of its present responsibilities from, and the membership of the European Communities (EC), which were founded in the 1950s in the spirit of the Schuman Declaration.
| Legend: S: signing F: entry into force T: termination E: expiry de facto supersession Rel. w/ EC/EU framework: de facto inside outside |
 European Union (EU)
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[Cont.] | |||||||||||||||
| European Communities (EC)
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(Pillar I) | ||||||||||||||||
| European Atomic Energy Community (EAEC or Euratom) | [Cont.] | ||||||||||||||||
 /  /  /  European Coal and Steel Community (ECSC)
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| European Economic Community (EEC) | |||||||||||||||||
| Schengen Rules | European Community (EC) | ||||||||||||||||
| 'TREVI' | Justice and Home Affairs (JHA, pillar II) | ||||||||||||||||
 North Atlantic Treaty Organisation (NATO)
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[Cont.] | Police and Judicial Co-operation in Criminal Matters (PJCC, pillar II) | |||||||||||||||
  Anglo-French alliance |
[Defence arm handed to NATO] | European Political Co-operation (EPC) | Common Foreign and Security Policy (CFSP, pillar III) | ||||||||||||||
 Western Union (WU)
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 /  Western European Union (WEU)
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[New tasks handed to EU] | |||||||||||||||
| [Social, cultural tasks handed to CoE] | [Cont.] | ||||||||||||||||
| Council of Europe (CoE)
| |||||||||||||||||
Davignon report
S: 27 October 1970 |
European Council conclusions
S: 2 December 1975 |
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- ¹Although not EU treaties per se, these treaties affected the development of the EU defence arm, a main part of the CFSP. The Franco-British alliance established by the Dunkirk Treaty was de facto superseded by WU. The CFSP pillar was bolstered by some of the security structures that had been established within the remit of the 1955 Modified Brussels Treaty (MBT). The Brussels Treaty was terminated in 2011, consequently dissolving the WEU, as the mutual defence clause that the Lisbon Treaty provided for EU was considered to render the WEU superfluous. The EU thus de facto superseded the WEU.
- ²The treaties of Maastricht and Rome form the EU's legal basis, and are also referred to as the Treaty on European Union (TEU) and the Treaty on the Functioning of the European Union (TFEU), respectively. They are amended by secondary treaties.
- ³The European Communities obtained common institutions and a shared legal personality (i.e. ability to e.g. sign treaties in their own right).
- ⁴Between the EU's founding in 1993 and consolidation in 2009, the union consisted of three pillars, the first of which were the European Communities. The other two pillars consisted of additional areas of cooperation that had been added to the EU's remit.
- ⁵The consolidation meant that the EU inherited the European Communities' legal personality and that the pillar system was abolished, resulting in the EU framework as such covering all policy areas. Executive/legislative power in each area was instead determined by a distribution of competencies between EU institutions and member states. This distribution, as well as treaty provisions for policy areas in which unanimity is required and qualified majority voting is possible, reflects the depth of EU integration as well as the EU's partly supranational and partly intergovernmental nature.
- ⁶Plans to establish a European Political Community (EPC) were shelved following the French failure to ratify the Treaty establishing the European Defence Community (EDC). The EPC would have combined the ECSC and the EDC.
See also