Lexikon
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 in 1993 upon the foundations of the European Communities. With over 500 million citizens, the EU combined 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, 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.
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 assured.
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.