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Following the end of World War II, several movements began advocating a European federation, such as the Union of European Federalists and the European Movement, founded in 1948. Those organizations exercised influence in the European unification process, but never in a decisive way.[citation needed]
Although the drafts of both the Maastricht Treaty and the Treaty establishing a Constitution for Europe mentioned federalism, the reference never made it to the text of the treaties adopted by consensus. The strongest advocates of European federalism have been Germany, Italy, Belgium and Luxembourg while those historically most strongly opposed have been the United Kingdom, Denmark[1] and France (with conservative heads of state and governments).[citation needed] Since the presidency of François Mitterrand (1981–1995), the French authorities have adopted a much more pro-European Unification position, as they consider that a strong EU is presenting the best "insurance" against a unified Germany which might become too strong and thus a threat for its neighbours
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