The European Economic Community (EEC) (also known as the Common Market in the English-speaking world, renamed the European Community (EC) in 1993) in OTL was an international organisation created with a view to bring about economic integration (including a single market) among the Inner Six of European integration; the Western European countries of Belgium, France, Germany, Italy, Luxembourg and the Netherlands.
The EEC was created by the Treaty establishing the European Economic Community (Treaty of Rome) of 1957. It gained a common set of institutions along with the European Coal and Steel Community (ECSC) and the European Atomic Energy Community (EURATOM) (collectively, the European Communities) under the 1965 Merger Treaty (Treaty of Brussels). With the entry into force of the Treaty of Maastricht in 1993, the organisation changed its name from the European Economic Community to the European Community (reflecting the more comprehensive nature of European integration), and was along with the aforementioned European Communities made to comprise the first of the three pillars of the new European Union (EU). The entire pillar division, and the EC along with it, were abolished upon the entry into force of the Treaty of Lisbon in 2009. The legal personality of the EC was at this point transferred to the EU as a whole, a change in line with the Lisbon Treaty's wider aim of consolidating the legal nature of the Union.
Alternate versions of the EEC have been discovered in the multiverse: