| 9 May 1950 | French Foreign Minister Robert Schuman made a declaration suggesting that France, the Federal Germany and other European states should gather their coal and steel resources under a High Authority. |
| 18 April 1951 | France, the Federal Germany, Italy, Belgium, Netherlands and Luxembourg signed the Treaty of Paris establishing the European Coal and Steel Community (ECSC). |
| 27 May 1952 | The “Six” signed the Treaty of the European Defense Community (EDC) in Paris. |
| 27 July 1952 | The ECSC Treaty entered into force. |
| 30 August 1954 | French National Assembly rejected the Treaty of the European Defense Community. |
| 20 October 1954 | Western European Union (WEU) was established. |
| 1 June 1955 | The Foreign Ministers of the “Six” met in Messina (Italy) and agreed to pursue further the economic integration process. (1-2 June 1955) |
| 29 May 1956 | At the conference held in Venice, the Foreign Ministers of the “Six” decided to open intergovernmental negotiations with the aims of establishing the European Economic Community and Atomic Energy Community. |
| 25 March 1957 | The “Six” signed the Treaty of Rome establishing the European Economic Community (EEC) and the European Atomic Energy Community (EURATOM). |
| 1 January 1958 | The Treaty of Rome entered into force. The Commission for the EEC and EURATOM was established in Brussels. |
| 19 March 1958 | Robert Schuman was elected as the President of the European Parliamentary Assembly. |
| 3 July 1958 | The basis Common Agricultural Policy (CAP) was laid down in a conference held in Stresa (Italy). (3-11 July 1958) |
| 1 January 1959 | The EEC started to gradually abolish its customs duties within EEC. |
| 8 June 1959 | Greece applied for an Association Agreement with the EEC. |
| 31 July 1959 | Turkey applied for an Association Agreement with the EEC. |
| 11 September 1959 | EEC Ministerial Council accepted Greece and Turkey association membership applications. |
| 28 September 1959 | The negotiations for the association of Turkey to the EEC started. (28-30 September 1959) |
| November 1959 | The first fundaments for the “Economic and Monetary Union” were laid down. |