Chronology
| Year | Month | Event |
| 1950 | May 9 | Robert Schuman proposes pooling Europe's coal and steel industries. |
| 1951 | April 18 | European Coal and Steel Community (ECSC) Treaty signed. |
| 1957 | March 25 | European Economic Community (EEC) and European Atomic Energy Community (Euratom) Treaties signed. |
| 1965 | April 8 | Treaty merging the institutions of the three European Communities signed. |
| 1968 | July 1 | Customs Union completed 18 months early. |
| 1973 | January 1 | Denmark, Ireland and the United Kingdom join the Community. |
| 1975 | February 28 | First Lome Convention with African, Caribbean and Pacific (ACP) countries signed. |
| 1979 | March 13 | European Monetary System (EMS) becomes operative. |
| 1981 | January 1 | Greece joins the European Community. |
| 1985 | June 29 | European Council endorses "White Paper": plan to complete single market by end 1992. |
| 1986 | January 1 | Spain and Portugal join the Community. |
| 1987 | July 1 | Single European Act enters into force. |
| 1989 | June 26-27 | Madrid European Council endorses plan for Economic and Monetary Union. |
| 1990 | October 3 | The five Laender of the former German Democratic Republic enter the Community as part of a united Germany. |
| 1991 | October 21 | European Community and European Free Trade Association (EFTA) agree to form the European Economic Area (EEA). |
| December 11 | Maastricht European Council agrees Treaty on European Union. | |
| December 16 | Poland, Hungary and Czechoslovakia sign first Europe Agreements on trade and political cooperation. | |
| 1993 | January 1 | European single market is achieved on time. |
| November 1 | Treaty on European Union enters into force after ratification by the member states. | |
| 1995 | January 1 | Austria, Finland and Sweden join the European Union. |
| 1997 | June 17 | Treaty of Amsterdam is concluded. |
| 1998 | March 12 | European Conference in London launces Europe-wide consultations on issues related to Common Foreign and Security Policy and Justice and Home Affairs. |
| March 30-31 | EU opens membership negotiations with Cyprus, Czech Republic, Estonia, Hungary, Poland and Slovenia. | |
| May 2 | Eleven EU member states qualify to launch the euro on January 1, 1999. | |
| July 1 | European Central Bank inaugurated in Frankfurt, Germany. | |
| 1999 | January 1 | EMU and euro launched in eleven EU countries. |
| June | Elections for European Parliament. | |
| 2002 | January-July | The euro becomes legal tender and permanently replaces national currencies in EMU countries. |