Am 4. September 1954 zieht der belgische Außenminister Paul-Henri Spaak eine Bilanz der ersten zehn Jahre der Zollunion zwischen Belgien, Luxemburg und den Niederlanden. Er unterstreicht die Tatsache, dass es sich dabei nur um eine Zwischenetappe auf dem Weg zum vereinten Europa handelt.

On 23 April 1955, Johan Willem Beyen and Joseph Luns, who share responsibility for the Dutch Foreign Ministry, send the Dutch diplomatic representatives abroad a telegram in which they review the consultations between Beyen and Belgian Foreign Minister Paul-Henri Spaak concerning European revival.

On 5 July 1955, Paul-Henri Spaak, Belgian Foreign Minister and President of the Council of Western European Union (WEU), gives an address at the first session of the Assembly of WEU.

On 11 May 1956, Paul-Henri Spaak, Belgian Foreign Minister and Chairman of the Intergovernmental Committee established by the Messina Conference, attends the debates of the Common Assembly of the European Coal and Steel Community (ECSC) on the Spaak Report and responds, in particular, to the criticisms of the French delegate, Michel Debré.

Im Jahr 1964 unterbreitet Paul Henri Spaak in der Communauté européenne mehrere Vorschläge, um die Bemühungen für ein politisches Europa wiederzubeleben.

On 17 March 1948, in Brussels, the Foreign Ministers of Belgium, France, Luxembourg, the Netherlands and the United Kingdom sign the Treaty of Economic, Social and Cultural Collaboration and Collective Self-Defence. This Treaty leads to the establishement of Western Union. From left to right: Paul-Henri Spaak, Georges Bidault, Joseph Bech, Baron Carel Godfried van Boetzelaer van Oosterhout and Ernest Bevin.

Am 6. Januar 1953 richtet Jean Monnet ein Schreiben an Robert Schuman und an Paul Henri Spaak, in dem er seine Auffassung von der Europäischen Politischen Gemeinschaft (EPG) darlegt.

On 7 May 1955, the Council of Western European Union (WEU) holds its first meeting in Paris, with, in particular, the Belgian delegation represented by the Belgian Foreign Minister, Paul-Henri Spaak (second from the right), and the United Kingdom delegation represented by the British Foreign Secretary, Harold Macmillan (on the left, with arms raised), who chairs the meeting.

On 9 March 1953, Paul-Henri Spaak, President of the Ad Hoc Assembly, hands to Georges Bidault, President of the Special Council of Ministers, the draft Treaty establishing the European Political Community. During the ceremony, Georges Bidault gives an address in which he emphasises the importance of European integration.

In November 1952, the Study Committee for the European Constitution, set up by the European movement and chaired by Paul-Henri Spaak, draws up an institutional proposal consisting of nine resolutions.