On 27 July 1957, in agreement with the Bundesrat, the Bundestag adopts the Act ratifying the Treaties establishing the European Economic Community (EEC) and the European Atomic Energy Community (EAEC).

On 10 July 1957, the French National Assembly adopts by 342 votes to 239 the draft law which authorises René Coty, President of the French Republic, to ratify the Treaties establishing the European Economic Community (ECC) and the European Atomy Energy Community (EAEC or Euratom), signed on 25 March 1957 in Rome by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 2 August 1957, the Official Journal of the French Republic publishes the Act authorising René Coty, President of the French Republic, to ratify the Treaty establishing the European Economic Community (EEC) and the annexes thereto, the Treaty establishing the European Atomic Energy Community (EAEC or Euratom) and the Convention on certain institutions common to the European Communities, signed in Rome on 25 March 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 14 October 1957, the Gazzetta Ufficiale, Official Journal of the Italian Republic, publishes the Act which authorises Giovanni Gronchi, President of the Italian Republic, to ratify the Treaty establishing the European Economic Community (EEC) and the annexes thereto, the Treaty establishing the European Atomic Energy Community (EAEC or Euratom) and the Convention on certain institutions common to the European Communities, signed in Rome on 25 March 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 26 November 1957, the Luxembourg Chamber of Deputies adopts the draft law authorising Grand Duchess Charlotte to ratify the Treaties establishing the European Economic Community (EEC) and the European Atomic Energy Community (EAEC or Euratom), signed on 25 March 1957 in Rome by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 3 December 1957, the Mémorial, Official Gazette of the Grand Duchy of Luxembourg, publishes the Act of 30 November 1957 which embodies the approval by the country of the Treaty establishing the European Economic Community (EEC), the annexes and additional protocols and convention thereto, signed in Rome on 25 March 1957 and in Brussels on 17 April 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 3 December 1957, the Mémorial, Official Gazette of the Grand Duchy of Luxembourg, publishes the Act of 30 November 1957 which embodies the approval by the country of the Treaty establishing the European Atomic Energy Community (EAEC or Euratom), together with the annexes and additional protocols thereto, signed in Rome on 25 March 1957 and in Brussels on 17 April 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 26 November 1957, during the parliamentary debates in the Belgian Senate, Fernand Dehousse, a Socialist Senator from Liège and a fervent European federalist, sets out in detail why he is in favour of the Senate’s ratifying the Treaties establishing the European Economic Community (EEC) and the European Atomic Energy Community (EAEC or Euratom).

On 25 December 1957, the Moniteur Belge publishes the Act of 2 December 1957 which embodies the approval, by the Belgian Parliament, of the Treaties establishing the European Economic Community (EEC) and the European Atomic Energy Community (EAEC or Euratom), together with other related acts.

On 5 December 1957, the Staatsblad van het Koninkrijk der Nederlanden, Bulletin of Acts and Decrees of the Kingdom of the Netherlands, publishes the Netherlands’ Act for the ratification of the Treaty establishing the European Economic Community (EEC), as well as the annexes and additional protocols and convention thereto, signed in Rome on 25 March 1957 and in Brussels on 17 April 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).

On 5 December 1957, the Staatsblad van het Koninkrijk der Nederlanden, Bulletin of Acts and Decrees of the Kingdom of the Netherlands, publishes the Netherlands’ act on the ratification by the Netherlands of the Treaty establishing the European Atomic Energy Community (EAEC or Euratom), as well as the annexes and additional protocols thereto, signed in Rome on 25 March 1957 and in Brussels on 17 April 1957 by the representatives of the six Member States of the European Coal and Steel Community (ECSC).