<P> The 1940 Summer Olympics, officially known as the Games of the XII Olympiad, were originally scheduled to be held from September 21 to October 6, 1940, in Tokyo, Japan . They were rescheduled for Helsinki, Finland, to be held from July 20 to August 4, 1940, but were ultimately cancelled due to the outbreak of World War II . Helsinki eventually hosted the 1952 Summer Olympics and Tokyo the 1964 Summer Olympics . </P> <P> The campaign to choose a city for 1940 began in 1932, with Barcelona, Rome, Helsinki, and Tokyo participating . Tokyo city officials suggested a campaign as a means of international diplomacy following Japan's alienation from the League of Nations due to the Mukden Incident, in which Japan occupied Manchuria and created the puppet state of Manchukuo . </P>

Who was supposed to host the 1940 olympics