The European Union (EU) is a supranational political and economic union of 27 member states that are located primarily in Europe. The Union has a total area of 4,233,255 km2 (1,634,469 sq mi) and an estimated total population of over 448 million. The EU has often been described as a sui generis political entity combining the characteristics of both a federation and a confederation.
Treaty of Paris (1951), establishing the ECSC
Signing ceremony of the Treaty of Rome (1957), establishing the ECC
Gerald Ford and the American delegation at the CSCE (1975)
Maastricht Treaty (1992), establishing the EU
Member state of the European Union
The European Union (EU) is a political and economic union of 27 member states that are party to the EU's founding treaties, and thereby subject to the privileges and obligations of membership. They have agreed by the treaties to share their own sovereignty through the institutions of the European Union in certain aspects of government. State governments must agree unanimously in the Council for the union to adopt some policies; for others, collective decisions are made by qualified majority voting. These obligations and sharing of sovereignty within the EU make it unique among international organisations, as it has established its own legal order which by the provisions of the founding treaties is both legally binding and supreme on all the member states. A founding principle of the union is subsidiarity, meaning that decisions are taken collectively if and only if they cannot realistically be taken individually.
A 2011 'family photo' of the European Council, which comprises the heads of state or government of the member states, along with President of the European Council and the President of the European Commission