The Maastricht Treaty, which created the European Union (EU), was signed in Maastricht on February 7, 1992, and it entered into force on November 1, 1993, after being ratified by the then 12 member states of the European Communities. The Intergovernmental Conferences (IGCs) on Political Union (PU) and Economic and Monetary Union (EMU) where the member states negotiated the amendments to the founding treaties took place against the turbulent geopolitical background of the fall of the Berlin Wall (1989), German unification, and the end of the Cold War. The new treaty amended the Treaty Establishing the European Economic Community (EEC) and established the European Community (EC) as the first pillar of the Union. It also amended the Treaty Establishing the European Coal and Steel Community (ECSC) and the Treaty Establishing the European Atomic Energy Community (EAEC). It further added two pillars of intergovernmental cooperation, namely Common Foreign and Security Policy (CFSP) in a second pillar and Justice and Home Affairs (JHA) cooperation in a third pillar.
Overall, the Maastricht Treaty constituted one of the most important treaty changes in the history of European integration. It included provisions on the creation of an Economic and Monetary Union (EMU), including a single European currency. It tried to increase the democratic legitimacy and efficiency of the decision-making process through empowerment of the European Parliament (EP) and the extension of Qualified Majority Voting (QMV). Next to introducing the principle of subsidiarity and the concept of European citizenship, it further developed existing policies such as social policy and added new ones including education, culture, public health, consumer protection, trans-European networks, industrial policy, and development cooperation.
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