Europa: Gateway to the European UnionOfficial portal, with links by subject and department, current activites and documents. The Treaty of Rome, establishing the European Economic Community, effective January 1, 1958, created a Common Market, whose objective was to develop integrated economic policies, a common tariff and the elimination of customs duties among members. The Treaty on European Union (Maastricht 1993) established the EU with the aim to achieve economic and monetary union among member states.