European Union

The European Union (EU) is a politico-economic union of 28 member states that are located primarily in Europe. It covers an area of 4,324,782 km2, with an estimated population of over 508 million. The EU operates through a system of supranational institutions and intergovernmental-negotiated decisions by the member states. The institutions are: the European Parliament, the European Council, the Council of the European Union, the European Commission, the Court of Justice of the European Union, the European Central Bank, and the Court of Auditors. The European Parliament is elected every five years by EU citizens.

The EU has developed an internal single market through a standardised system of laws that apply in all member states. Within the Schengen Area, passport controls have been abolished. EU policies aim to ensure the free movement of people, goods, services, and capital, enact legislation in justice and home affairs, and maintain common policies on trade, agriculture, fisheries, and regional development. The monetary union was established in 1999 and came into full force in 2002. It is currently composed of 19 member states that use the euro as their legal tender.
The EU traces its origins from the European Coal and Steel Community (ECSC) and the European Economic Community (EEC), formed by the Inner Six countries in 1951 and 1958, respectively. In the intervening years, the community and its successors have grown in size by the accession of new member states and in power by the addition of policy areas to its remit. The Maastricht Treaty established the European Union under its current name in 1993 and introduced European citizenship. The latest major amendment to the constitutional basis of the EU, the Treaty of Lisbon, came into force in 2009.

Covering 7.3% of the world population, the EU in 2014 generated a nominal gross domestic product (GDP) of 18.495 trillion US dollars, constituting approximately 24% of global nominal GDP and 17% when measured in terms of purchasing power parity. Additionally, 26 out of 28 EU countries have a very high Human Development Index, according to the UNDP. In 2012, the EU was awarded the Nobel Peace Prize. Through the Common Foreign and Security Policy, the EU has developed a role in external relations and defence. The union maintains permanent diplomatic missions throughout the world and represents itself at the United Nations, the WTO, the G8, and the G-20. Because of its global influence, the European Union has been described as a current or as a potential superpower.

History

Preliminary (1945–57)
After World War II, European integration was seen as an antidote to the extreme nationalism which had devastated the continent. The 1948 Hague Congress was a pivotal moment in European federal history, as it led to the creation of the European Movement International and of the College of Europe, where Europe's future leaders would live and study together. 1952 saw the creation of the European Coal and Steel Community, which was declared to be "a first step in the federation of Europe." The supporters of the Community included Alcide De Gasperi, Jean Monnet, Robert Schuman, and Paul-Henri Spaak.

Treaty of Rome (1957–92)
In 1957, Belgium, France, Italy, Luxembourg, the Netherlands and West Germany signed the Treaty of Rome, which created the European Economic Community (EEC) and established a customs union. They also signed another pact creating the European Atomic Energy Community (Euratom) for co-operation in developing nuclear energy. Both treaties came into force in 1958.
The EEC and Euratom were created separately from ECSC, although they shared the same courts and the Common Assembly. The EEC was headed by Walter Hallstein (Hallstein Commission) and Euratom was headed by Louis Armand (Armand Commission) and then Étienne Hirsch. Euratom was to integrate sectors in nuclear energy while the EEC would develop a customs union among members.
Through the 1960s, tensions began to show, with France seeking to limit supranational power. Nevertheless, in 1965 an agreement was reached and on 1 July 1967 the Merger Treaty created a single set of institutions for the three communities, which were collectively referred to as the European Communities. Jean Rey presided over the first merged Commission (Rey Commission).
In 1973, the Communities enlarged to include Denmark (including Greenland, which later left the Community in 1985, following a dispute over fishing rights), Ireland, and the United Kingdom. Norway had negotiated to join at the same time, but Norwegian voters rejected membership in a referendum. In 1979, the first direct, democratic elections to the European Parliament were held.
Greece joined in 1981; Portugal and Spain in 1986. In 1985, the Schengen Agreement paved the way for the creation of open borders without passport controls between most member states and some non-member states. In 1986, the European flag began to be used by the Community and the Single European Act was signed.
In 1990, after the fall of the Eastern Bloc, the former East Germany became part of the Community as part of a reunified Germany. With further enlargement planned to include the former communist states, as well as Cyprus and Malta, the Copenhagen criteria for candidate members to join the EU were agreed upon in June 1993.

Maastricht Treaty (1992–present)
The European Union was formally established when the Maastricht Treaty—whose main architects were Helmut Kohl and François Mitterrand—came into force on 1 November 1993. The treaty also gave the name European Community to the EEC, even if it was referred as such before the treaty. In 1995, Austria, Finland, and Sweden joined the EU. In 2002, euro banknotes and coins replaced national currencies in 12 of the member states. Since then, the eurozone has increased to encompass 19 countries. In 2004, the EU saw its biggest enlargement to date when Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia joined the Union.
On 1 January 2007, Romania and Bulgaria became EU members. In the same year, Slovenia adopted the euro, followed in 2008 by Cyprus and Malta, by Slovakia in 2009, by Estonia in 2011, by Latvia in 2014 and by Lithuania in 2015. In June 2009, the European Parliament elections were held, leading to the second Barroso Commission, and by July, Iceland formally applied for EU membership, but has since suspended negotiations.

On 1 December 2009, the Lisbon Treaty entered into force and reformed many aspects of the EU. In particular, it changed the legal structure of the European Union, merging the EU three pillars system into a single legal entity provisioned with a legal personality, created a permanent President of the European Council, the first of which was Herman Van Rompuy, and strengthened the position of the High Representative of the Union for Foreign Affairs and Security Policy. In 2012, the EU received the Nobel Peace Prize for having "contributed to the advancement of peace and reconciliation, democracy, and human rights in Europe." In 2013, Croatia became the 28th EU member.