Treaty establishing the
European Union (EU). Agreed in 1991 and signed in 1992, the treaty took effect on 1 November 1993 following ratification by member states. It advanced the commitment of member states to
economic and monetary union (but included an opt-out clause for the United Kingdom); provided for intergovernmental arrangements for a common foreign and security policy; increased cooperation on justice and home affairs policy issues (though the
Social Chapter was rejected by the UK until a change of government in 1997); introduced the concept of EU citizenship (as a supplement to national citizenship); established new regional development bodies; increased the powers of the
European Parliament; and accepted the principle of
subsidiarity (a controversial term defining the limits of European Community involvement in national affairs).
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