The European Union (EU) is an economic and political union of 27 member states, located primarily in Europe. Committed to regional integration, the EU was established by the Treaty of Maastricht on 1 November 1993 upon the foundations of the European Communities. With over 500 million citizens, the EU combined generates an estimated 30% share (US$ 18.4 trillion in 2008) of the nominal gross world product and about 22% (US$15.2 trillion in 2008) of the PPP gross world product.

The EU has developed a single market through a standardised system of laws which apply in all member states, ensuring the free movement of people, goods, services, and capital. It maintains common policies on trade, agriculture, fisheries and regional development. Sixteen member states have adopted a common currency, the euro, constituting the Eurozone. The EU has developed a limited role in foreign policy, having representation at the World Trade Organization, G8, G-20 major economies and at the United Nations. It enacts legislation in justice and home affairs, including the abolition of passport controls by the Schengen Agreement between 22 EU and 3 non-EU states.

As an international organisation, the EU operates through a hybrid system of supranationalism and intergovernmentalism. In certain areas, decisions are made through negotiation between member states, while in others, independent supranational institutions are responsible without a requirement for unanimity 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 member states' citizens, to whom the citizenship of the European Union is guaranteed.

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, the EU has grown in size through enlargement, and in power through the addition of policy areas to its remit.

"If you cannot join them, beat them!"

— Danish Foreign Minster Uffe Ellemann-Jensen, in a short statement to television before the European Championship 1992 Final, won by Denmark, shortly after the Danes voted against the Maastricht Treaty

"We do not fear that the operations of time may never bring a united Europe, with a reunited Germany at its centre. We do not know how it will happen, how this unnaturally divided Germany is to become once again. It is obscure to us, and we must take refuge in the belief that history will find ways and means of overcoming the unnatural and restoring the natural: a Germany as a consciously serving member of a Europe united in self-awareness – not as its lord and master...

Let us not delude ourselves over the fact that among the difficulties delaying the unification of Europe is a mistrust of the purity of German intentions, a fear by other peoples of Germany and of hegemonic plans that its vital energy may install into it, which in their view it does not conceal very well….It is for the rising German generation, for German youth, to dispel the mistrust, this fear, by rejecting what has long been rejected and clearly and unanimously announcing their desire: not for a German Europe, but for a European Germany."

— Thomas Mann, in a lecture at the University of Hamburg, 1953

"We are a very special construction unique in the history of mankind ... Sometimes I like to compare the EU as a creation to the organisation of empire. We have the dimension of empire .. What we have is the first non-imperial empire .. We have 27 countries that fully decided to work together and to pool their sovereignty. I believe it is a great construction and we should be proud of it"

— Jose Manuel Barroso, President of the European Commission, 2007 [1]

See also

• South American Community of Nations
• United States
• Europe
• European Parliament