European Atomic Energy Community Euratom at Val Duchesse in 1956 drew up the essentials of the new treaties. Euratom would foster co-operation in the nuclear field, at the time a very popular area, and would, along with the EEC, share the Common Assembly and Court of Justice of the ECSC, but not its executives. Euratom would have its own Council and Commission, with fewer powers than the High Authority of the European Coal and Steel Community. On 25 March 1957, the Treaties of Rome (the Euratom Treaty and the EEC Treaty) were signed by the ECSC members and on 1 January 1958 they came
European Economic Community compromise was reached with the Luxembourg compromise on 29 January 1966 whereby a gentlemen's agreement permitted members to use a veto on areas of national interest. On 1 July 1967 when the Merger Treaty came into operation, combining the institutions of the ECSC and Euratom into that of the EEC, they already shared a Parliamentary Assembly and Courts. Collectively they were known as the "European Communities". The Communities still had independent personalities although were increasingly integrated. Future treaties granted the community new powers beyond simple economic matters which had achieved a high level of integration. As it got closer to