Since 1993, the term used to describe the European Community and related institutions. The entry into force of the Maastricht Treaty of European Union on November 1, 1993, introduced this change in terminology regarding the EC and many of its institutions. Originally established by the Treaty of Rome in 1957 and known previously as the European Economic Community and the Common Market. Originally composed of six European nations, it has expanded to 15. The EU attempts to unify and integrate member economies by establishing a customs union and common economic policies, including CAP. Member nations include Austria, Belgium, Denmark, Germany, Greece, Finland, France, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Spain, Sweden and the United Kingdom.