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Formed by the European Economic Community (EEC) and European Atomic Energy Community (EURATOM) to created a common market. -
ECSC, EEC and EURATOM was replaced by the Commission of the European Communities. Each community shared common institutions and known as the European Communities. -
Create a single market (remove non-tariff barriers to cross-borders intra-community trade) and a forerunner of the European Union’s Common Foreign and Security Policy -
Foundation treaty of the European Union. Introduction of a single currency, common foreign and security policies and shared European citizenship. -
It made substantial changes to the treaty of Maastricht. Member states agreed transfer certain powers from national governments to the European Parliament across diverse areas, adopting civil and criminal laws and enacting common foreign and security policy. -
Reformed the institutional structure of the European Union to withstand eastward expansion, that was originally intended to do in the Amsterdam Treaty. The enter into force was in doubt for a time, because of the rejection of Irish voters. New replaced weighted voting system. -
Changes: move from unanimity to qualified majority voting in at least 45 policy areas in the Council of Ministers, a change in calculating such a majority to a new double majority, more powerful European Parliament, a consolidate legal personality for the EU and the creation of a long term President of the European Council. To complete the process started by the treaty of Amsterdam and treaty of nice.