The 1964/65 New York World's Fair was not sanctioned by the Bureau of International Exposition (BIE), based in Paris, because Moscow won the bid to host a world's fair in 1967, to celebrate their 50th anniversary of the Bolshevik Revolution. The communists couldn't get their act together, so the Soviet Union drop out, due to financial or political problems. BIE was in the process of giving recognition to New York City, but the Canadians protest, given that they came in second in the original voting, claiming to their rights to host a world's fair in Montreal, in observation of their centennial. The rules of BIE at the time was that a Class A Universal Exposition are limited to once every decade. Expo 67, with the theme: "Man and his World," was sanctioned by BIE instead of New York.