1965 8th April
Merger Treaty Signature
France joined the agreement to create a single Commission and Council for the three European Communities.
European integration · permanent subject timeline
Merger Treaty and the European Communities
The institutional merger of the EEC, ECSC and Euratom executives. This page combines historical context with 9 matching records drawn directly from the World History Database EEC archive.
Historical context
Merger Treaty and the European Communities: overview and significance
What happened?
The Merger Treaty created a single Commission and a single Council for the three European Communities. It was signed in 1965 and took effect in 1967.
Why was it important?
The treaty simplified the institutional structure and reinforced the idea that the EEC, ECSC and Euratom formed a connected system of European Communities.
World History Database records
Merger Treaty and the European Communities timeline
The records below are selected from the 936-record EEC and European integration archive and rendered as static HTML in chronological order.
1965
1965 8th April
Merger Treaty
Heads the West German government when the Six sign the Merger Treaty creating a single Council and Commission.
1965 8th April
Merger Treaty
Represents Italian foreign policy as the Merger Treaty is signed in Brussels.
1965 8th April
Merger Treaty
Heads the Italian government when the Six sign the Merger Treaty for the European Communities.
1967
1967 1st July
Merger Treaty Takes Effect
The Merger Treaty took effect, creating a single Commission and Council for the three European Communities.
1967 1st July
Merger Treaty Enters into Force
Heads the Italian government when the Merger Treaty creates a single Commission and Council for the Communities.
1967 1st July
Unified European Communities Institutions
Serves as foreign minister when the Communities begin operating with unified executive institutions.
1986
1986
Legislation
The first major revision of the treaties since the Merger Treaty, leaders signed the Single European Act in February 1986. The text dealt with institutional reform, including extension of community powers 'g in particular in regarding foreign policy. It was a major component in completing the single market
1986
Single European Act
The first major revision of the treaties since the Merger Treaty, leaders signed the Single European Act in February 1986. The text dealt with institutional reform, including extension of community powers 'g in particular in regarding foreign policy. It was a major component in completing the single market
Editorial provenance
Sources and editorial review
Compiled and edited by World History Database.
Historical context is editorial material; the chronology is generated from World History Database EEC records.
Last reviewed: September 2026.
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