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
Euratom Treaty Euratom Treaty The Euratom Treaty, officially the Treaty establishing the European Atomic Energy Community, established the European Atomic Energy Community. It was signed on 25 March 1957, at the same time as the Treaty establishing the European Economic Community (EEC Treaty). The Euratom treaty is less well-known due to the lower profile of the organisation it founded. While the EEC has evolved into what is now the European Union, Euratom has remained much the same as it was in 1957, albeit governed by the institutions of the European Union. It was established with its own independent institutions, but the 1967