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The European Union (EU) is an economic and political union of 27 member states[9] which are located primarily in Europe. Committed to regional integration, the EU was established by the Treaty of Maastricht in 1993 upon the foundations of the European Communities. With over 500 million citizens, the EU generated an estimated 28% share (US$ 16.5 trillion) of the nominal and about 21% (US$14.8 trillion) of the PPP gross world product in 2009.
The EU has developed a single market through a standardised system of laws which apply in all member states, and ensures the free movement of people, goods, services, and capital, including the abolition of passport controls by the Schengen Agreement between 22 EU states. It enacts legislation in justice and home affairs, and maintains common policies on trade, agriculture, fisheries and regional development. Sixteen member states have adopted a common currency, the euro, constituting the eurozone.
Having a legal personality, the EU is able to conclude treaties with countries. It has devised the Common Foreign and Security Policy, thus developing a limited role in European defence and foreign policy. Permanent diplomatic missions of the EU are established around the world and representation at the United Nations, WTO, G8 and G-20 is maintained. EU delegations are headed by EU ambassadors.
The EU operates through a hybrid system of supranationalism and intergovernmentalism. In certain areas, decisions are taken by independent supranational institutions, while in others, they are made through negotiation between member states. Important institutions of the EU include the European Commission, the Council of the European Union, the European Council, the Court of Justice of the European Union, and the European Central Bank. The European Parliament is elected every five years by EU citizens.
The EU traces its origins from the European Coal and Steel Community formed among six countries in 1951 and the Treaty of Rome formed in 1957 by the same states. Since then, it has grown in size through enlargement, and in power through the addition of policy areas to its remit. The last amendment to the constitutional basis of the EU came into force in 2009 and was the Lisbon Treaty, by virtue of which the Charter of Fundamental Rights of the European Union was elevated to legally binding status.
