The Merger Treaty
In 1967, these became known as the European Communities (EC). The Merger Treaty, also known as the Treaty of Brussels, was a European treaty that unified the executive institutions of the European Coal and Steel Community (ECSC), Atomic Energy Community (Euratom) and the Economic Community (EEC). The treaty was signed in Brussels on 8 April 1965 and came into force on 1 July 1967. It set out that the Commission of the EEC and the Council of the EEC should replace the Commission and Council of Euratom and the High Authority and Council of the ECSC. Although each Community remained legally independent, they shared common institutions (prior to this treaty, they already shared a Parliamentary Assembly and Court of Justice) and were together known as the European Communities. This treaty is regarded by some as the real beginning of the modern European Union.