Treaties of the European Union the Functioning of the European Union (originally signed in Rome in 1957 as the Treaty establishing the European Economic Community, aka The Treaty of Rome), lay out how the EU operates, and there are a number of satellite treaties which are interconnected with them. The treaties have been repeatedly amended by other treaties over the 65 years since they were first signed. The consolidated version of the two core treaties is regularly published by the European Commission. The two principal treaties on which the EU is based are the Treaty on European Union (TEU; Maastricht Treaty, effective since 1993) and
European Economic Area idea of the EEC enlarging with more member states, as he feared that it would impede the ability of the Community to complete the internal market reform and establish the monetary union. Delors proposed a European Economic Space (EES) in January 1989, which was later renamed the European Economic Area, as it is known today. By the time the EEA was established, however, several developments hampered its credibility. First of all, Switzerland rejected the EEA agreement in a national referendum on 6 December 1992 obstructing full EU-EFTA integration within the EEA. Furthermore, Austria had applied for full EEC membership in