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The concept of a forum for the world's major industrialized democracies emerged following the 1973 oil crisis and subsequent global recession. In 1974 the United States created the Library Group, an informal gathering of senior financial officials from the United States, the United Kingdom, West Germany, Japan and France. In 1975, French President Valéry Giscard d'Estaing invited the heads of government from West Germany, Italy, Japan, the United Kingdom and the United States to a summit in Rambouillet. The six leaders agreed to an annual meeting organized under a rotating presidency, forming the Group of Six (G6). The following year, Canada joined the group at the behest of Germany's Chancellor Helmut Schmidt and U.S. President Gerald Ford[3] and the group became the 'Group of Seven' -or G7. The European Union is represented by the President of the European Commission and the leader of the country that holds the Presidency of the Council of the European Union. The President of the European Commission has attended all meetings since it was first invited by the United Kingdom in 1977 and the Council President now also regularly attends.
Credit: wikipedia.org