The European Union consists of 28 member countries and over 500 million citizens. It was founded after World War 2 to promote peace and prosperity in Europe. Key institutions of the EU include the European Commission, which proposes laws and policies, the Council of the EU which represents the member states, and the European Parliament which is elected by EU citizens. The EU has expanded from its original 6 countries to the current 28 through successive treaties which have increased cooperation on policies around trade, immigration, security and more. The EU aims to promote values of unity and freedom of movement across its members.