The Single European Act updated the European Community’s rules to speed up decision-making and help complete a “single market.” This set the stage for deeper integration by making it easier to pass common laws needed for cross-border trade and business.
EU leaders agreed to open two major negotiating tracks: one on Economic and Monetary Union (EMU) and one on Political Union. These talks became the main pathway to the Treaty on European Union, later known as the Maastricht Treaty.
At the Maastricht summit, heads of government reached the key political agreement on a new Treaty on European Union. The deal combined plans for a single currency, new foreign-policy cooperation, and new cooperation on justice and internal security.
Foreign and finance ministers from the 12 member states signed the Treaty on European Union in Maastricht. The treaty created the European Union and set a timetable and rules for moving toward a single currency, while also expanding cooperation beyond economics.
Danish voters rejected ratification of the Maastricht Treaty, creating a major obstacle because the treaty required approval by every member state. The vote signaled growing public concern about national sovereignty and the pace of European integration.
Ireland held a referendum to amend its constitution so the state could ratify the Treaty on European Union. The “Yes” vote cleared a key legal requirement and showed that some countries were using direct public votes to settle major treaty changes.
French voters approved the Maastricht Treaty by a slim margin, a result often described as the “petit oui” (small yes). The close vote showed that the treaty’s push toward a single currency and deeper political links was controversial even in a founding member state.
EU leaders negotiated special exceptions for Denmark so ratification could move forward. These opt-outs covered areas including the euro (EMU), defense policy, justice and home affairs, and how EU citizenship would apply domestically.
After receiving opt-outs at Edinburgh, Denmark held a second referendum and approved the Maastricht Treaty. This removed one of the last major political barriers and helped make unanimous ratification possible.
In the United Kingdom, Prime Minister John Major tied the treaty to a vote of confidence to overcome internal party rebellion. The House of Commons backed the government, helping complete the ratification path for one of the treaty’s most contested member states.
The Treaty on European Union entered into force, formally creating the European Union. It introduced a structure often described as “three pillars”: the existing European Communities plus cooperation on foreign and security policy and on justice and home affairs.
With Maastricht in force, EU citizenship became a formal status for nationals of member states, including rights linked to political participation and free movement. The treaty also strengthened the European Parliament’s role, including expanding the co-decision procedure so elected representatives had more influence over EU laws.
Maastricht Treaty: Creation of the European Union (1991-1993)