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The European Parliament approved the plan; national parliaments did not. But the work formed the basis of the 1986 Single European Act.
Read about the vision in ‘Battling for the Union’: https://europa.eu/!MBMFQb and this @EUI_EU Jean Monnet Lecture: https://europa.eu/!fG6DDB

🐦🔗: https://nitter.eu/EUPublications/status/1565017587582488577