In 1946, Gerard Marinus Nederhorst, member of the Netherlands Social Democratic Workers' Party (SDAP), drafts a note giving details of the successive stages for the establishment of the United States of Europe.

On 11 October 1946, commenting on the pro-European address given by Winston Churchill, former British Prime Minister, at the University of Zurich, the Brussels newspaper Le Phare Dimanche emphasises the essential role that the European Left is to play in the future establishment of the United States of Europe.

At the Second International Conference for the United Socialist States of Europe, held in Montrouge, Paris, on 21 and 22 June 1947, Marceau Pivert, member of the executive committee of the French Section of the Workers’ International (SFIO), sets out the basic premises of the International Committee for Study and Action for the United Socialist States of Europe, which he chairs.

At the Second International Conference for the United Socialist States of Europe, held in Montrouge, Paris, on 21 and 22 June 1947, leaders of socialist parties, trade unionists, pacifists, cooperators, deportees and intellectuals from 14 European countries share their ideas on the establishment of a unified socialist Europe.

At the Second International Conference for the United Socialist States of Europe, held in Montrouge, Paris, on 21 and 22 June 1947, leaders of socialist parties, trade unionists, pacifists, cooperators, deportees and intellectuals from 14 European countries adopt a resolution that sets out the aims and objectives of a unified socialist Europe.

In August 1947, Dr Jacques Robin, Member of the International Executive Committee of the Socialist Movement for the United States of Europe (MSEUE), assesses the Second International Conference for the United Socialist States of Europe, held in Montrouge, Paris, on 21 and 22 June 1947.

In December 1948, the Socialist Movement for the United States of Europe (MSEUE) calls on all socialists in Europe to unite around a European socialist action programme in order to find a collective solution to the problems affecting Europe.

In December 1948, answering a series of questions for the Belgian monthly publication Les cahiers socialistes, Marceau Pivert, member of the executive committee of the French Section of the Workers’ International (SFIO), describes his notion of European integration.

Anlässlich des Kongresses des Mouvement socialiste français pour les États-Unis d'Europe im Oktober 1949 in Issy-les-Moulineaux (Paris) fragt die französische Tageszeitung Le Monde nach der Aufgabe und dem Aufbau des zukünftigen vereinten Europas.

At the third annual congress of the Socialist Movement for the United States of Europe (MSEUE), held in Paris on 5, 6 and 7 November 1949, Francis-Louis Closon, Director of the French National Institute for Statistics and Economic Studies (INSEE), and Sébastien Constant, both French members of the movement, submit a report on the problems associated with the planning of Europe’s basic industries.

At the third annual Congress of the Socialist Movement for the United States of Europe (MSEUE), held in Paris on 5, 6 and 7 November 1949, the participants adopt a series of resolutions on European integration.

In 1950, André Philip, French member of the Consultative Assembly of the Council of Europe, head of the French delegation to the United Nations Economic Commission for Europe and President of the Socialist Movement for the United States of Europe (MSEUE), criticises the views of the British Labour Party on European unity.

Chef de la Section française de l'Internationale ouvrière (SFIO) et éditorialiste influent du journal Le Populaire, Léon Blum y expose ses réflexions sur la doctrine socialiste et y défend l'idéal de l'unité européenne.

On 16 February 1951, in Paris, Guy Mollet, Secretary-General of the SFIO Socialist Party and Minister of State responsible for the Council of Europe, gives a lecture on the manner in which the Socialists view the European Union and the creation of a United States of Europe.

In September 1951, Enrico Gironella, Secretary-General of the Socialist Movement for the United States of Europe (MSEUE), publishes a pamphlet in which he outlines the role to be played by socialist forces in the unification of Europe.

On 16 October 1953, five days after the meeting of the International Committee of the Socialist Movement for the United States of Europe (MSEUE) in The Hague, the Dutch Labour Party Partij van de Arbeid drafts a brief report on the MSEUE Congress.

On 11 October 1953, at its congress in The Hague, the Socialist Movement for the United States of Europe (MSEUE) launches an appeal for European unification.

On 11 October 1953, at its congress in The Hague, the Socialist Movement for the United States of Europe (MSEUE) adopts four resolutions on the issues surrounding European integration.