The European Economic Community (EEC) was a regional organisation created by the Treaty of Rome of 1957, aiming to foster economic integration among its member states. It was subsequently renamed the European Community (EC) upon becoming integrated into the first pillar of the newly formed European Union in 1993. In the popular language, however, the singular European Community was sometimes inaccurately used in the wider sense of the plural European Communities, in spite of the latter designation covering all the three constituent entities of the first pillar.
The Western European Union was the international organisation and military alliance that succeeded the Western Union (WU) after the 1954 amendment of the 1948 Treaty of Brussels. The WEU implemented the Modified Brussels Treaty. During the Cold War, the Western Bloc included the WEU member states and the United States and Canada as part of the North Atlantic Treaty Organization (NATO).
The Treaty of Nice was signed by European leaders on 26 February 2001 and came into force on 1 February 2003.
The Treaty of Rome, or EEC Treaty, brought about the creation of the European Economic Community (EEC), the best known of the European Communities (EC). The treaty was signed on 25 March 1957 by Belgium, France, Italy, Luxembourg, the Netherlands and West Germany, and it came into force on 1 January 1958. Originally the "Treaty establishing the European Economic Community", and now continuing under the name "Treaty on the Functioning of the European Union", it remains one of the two most important treaties in what is now the European Union (EU).
The Treaty of Paris was signed on 18 April 1951 between France, Italy, West Germany, Belgium, Luxembourg, and the Netherlands, establishing the European Coal and Steel Community (ECSC), which subsequently became part of the European Union. The treaty came into force on 23 July 1952 and expired on 23 July 2002, exactly fifty years after it came into effect.
The European Atomic Energy Community is an international organisation established by the Euratom Treaty on 25 March 1957 with the original purpose of creating a specialist market for nuclear power in Europe, by developing nuclear energy and distributing it to its member states while selling the surplus to non-member states. However, over the years its scope has been considerably increased to cover a large variety of areas associated with nuclear power and ionising radiation as diverse as safeguarding of nuclear materials, radiation protection and construction of the International Fusion Reactor ITER.
The Treaty establishing the European Defence Community, also known as the Treaty of Paris, is an unratified treaty signed on 27 May 1952 by the six 'inner' countries of European integration: the Benelux countries, France, Italy, and West Germany. The treaty would have created a European Defence Community (EDC) with a pan-European defence force. The treaty failed to obtain ratification in the French Parliament and it was never ratified by Italy, so it consequently never entered into force. Instead, the London and Paris Conferences provided for West Germany's accession to NATO and the Western European Union (WEU), the latter of which was a transformed version of the pre-existing Western Union.
The European Communities (EC) were three international organizations that were governed by the same set of institutions. These were the European Coal and Steel Community (ECSC), the European Atomic Energy Community, and the European Economic Community (EEC); the last of which was renamed the European Community (EC) in 1993 by the Maastricht Treaty establishing the European Union. The European Union was established at that time more as a concept rather than an entity, while the Communities remained the actual subjects of international law impersonating the rather abstract Union, becoming at the same time its first pillar. In the popular language, however, the singular European Community was sometimes inaccurately used interchangeably with the plural phrase, in the sense of referring to all three entities. The European Coal and Steel Community ceased to exist in 2002 when its founding treaty expired. The European Community was merged with the second and third EU pillars by the Treaty of Lisbon in 2009, finally allowing the European Union to move beyond being only a concept and to assume the shape of a legally incorporated international organization with juridical personality, designated as the legal successor to the Community. However, the reformed EU has not become entirely unified, because Euratom, though governed with the EU by the common set of institutions, has been retained as an entity distinct from the EU, along with a number of other international entities, such as the European Investment Bank, the European University Institute, the European Stability Mechanism, and the Unified Patent Court.
The Treaty of Amsterdam, officially the Treaty of Amsterdam amending the Treaty on European Union, the Treaties establishing the European Communities and certain related acts, was signed on 2 October 1997, and entered into force on 1 May 1999; it made substantial changes to the Treaty of Maastricht, which had been signed in 1992.
The Single European Act (SEA) was the first major revision of the 1957 Treaty of Rome. The Act set the European Community an objective of establishing a single market by 31 December 1992, and a forerunner of the European Union's Common Foreign and Security Policy (CFSP) it helped codify European Political Co-operation. The amending treaty was signed at Luxembourg City on 17 February 1986 and at The Hague on 28 February 1986. It came into effect on 1 July 1987, under the Delors Commission.
The Merger Treaty, also known as the Treaty of Brussels, was a European treaty which unified the executive institutions of the European Coal and Steel Community (ECSC), European Atomic Energy Community (Euratom) and the European Economic Community (EEC). The treaty was signed in Brussels on 8 April 1965 and came into force on 1 July 1967. It set out that the Commission of the European Communities should replace the High Authority of the ECSC, the Commission of the EEC and the Commission of Euratom, and that the Council of the European Communities should replace the Special Council of Ministers of the ECSC, the Council of the EEC and the Council of Euratom. Although each Community remained legally independent, they shared common institutions and were together known as the European Communities. This treaty is regarded by some as the real beginning of the modern European Union.
Between 1993 and 2009, the European Union (EU) legally comprised three pillars. This structure was introduced with the Treaty of Maastricht 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.
- The European Communities pillar handled economic, social and environmental policies. It comprised the European Community (EC), the European Coal and Steel Community, and the European Atomic Energy Community (EURATOM).
- The Common Foreign and Security Policy (CFSP) pillar took care of foreign policy and military matters.
- Police and Judicial Co-operation in Criminal Matters (PJCCM) brought together co-operation in the fight against crime. This pillar was originally named Justice and Home Affairs (JHA)
The Euratom Treaty, officially the Treaty establishing the European Atomic Energy Community, established the European Atomic Energy Community. It was signed on 25 March 1957 at the same time as the Treaty establishing the European Economic Community.
The European Political Co-operation (EPC) was the common term for the co-ordination of foreign policy between member states of the European Communities (EC) from its inception in 1970 until the EPC was superseded by the new European Union's (EU) Common Foreign and Security Policy (CFSP) pillar upon the entry into force of the Maastricht Treaty in November 1993.
The Davignon report, also referred to as the Luxembourg report, published on 27 October 1970, was a report on the future foreign policy of European Economic Community member nations. It was written by a council chaired by Étienne Davignon of the Belgian Foreign Office. The committee was appointed by the Council of the European Communities to make proposals on political cooperation between the member states. It recommended that member states should try to speak with a single voice on international problems, a proposal that was approved by all six member governments. It resulted first in European Political Cooperation and later in the European Union's Common Foreign and Security Policy in 1992.
The Treaty of Brussels, also referred to as the Brussels Pact, was the founding treaty of the Western Union (WU) between 1948 and 1954, when it was amended as the Modified Brussels Treaty (MTB) and served as the founding treaty of the Western European Union (WEU) until its termination in 2010. The treaty provided for the organisation of military, economic, social and cultural cooperation among member states as well as a mutual defence clause.
This is a timeline of European Union history and its previous development.
The London and Paris Conferences were two related conferences held in London and Paris during September–October 1954 to determine the status of West Germany. The talks concluded with the signing of the Paris Agreements, which granted West Germany some sovereignty, ended the occupation, and allowed its admittance to NATO. Furthermore, both West Germany and Italy joined the Brussels Treaty on 23 October 1954. The Agreements went into force on 5 May 1955. The participating powers included France, the United Kingdom, Belgium, the Netherlands, Luxembourg, West Germany, Italy, Canada, the United States, and remaining NATO members.
The Western Union (WU), also referred to as the Brussels Treaty Organisation (BTO), was the European military alliance established between France, the United Kingdom (UK) and the three Benelux countries in September 1948 in order to implement the Treaty of Brussels signed in March the same year. Under this treaty the signatories, referred to as the five powers, agreed to collaborate in the defence field as well as in the political, economic and cultural fields.
The European Union (EU) and the North Atlantic Treaty Organisation (NATO) are two main treaty-based Western organisations for cooperation between member states, both headquartered in Brussels, Belgium. Their natures are different and they operate in different spheres: NATO is a purely intergovernmental organisation functioning as a military alliance whose primary task is to implement article 5 in the North Atlantic Treaty on collective territorial defence. The EU on the other hand is a partly supranational and partly intergovernmental sui generis entity akin to a confederation that entails wider economic and political integration. Unlike NATO, the EU pursues a foreign policy in its own right—based on consensus, and member states have equipped it with tools in the field of defence and crisis management; the Common Security and Defence Policy (CSDP) structure.
European Unionportal 
European Union (EU)
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European Coal and Steel Community (ECSC)
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North Atlantic Treaty Organisation (NATO)
Western Union (WU)
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Western European Union (WEU)