The Olympic dreams of London, Paris, Madrid, New York and Moscow rest in the hands of the 116-strong International Olympic Committee on Wednesday.
So who makes up this diverse bunch of royals, politicians, sports administrators and former Olympians?
Find out with our rundown on the members from North America. Check out another region by clicking on the map above.
Three of the 116 will not vote at all, while another 14 cannot vote in the first round, for a variety of reasons.
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Key player: Dick Pound
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Robert Ctvrtlik USA
Age: 41 - member since 1999
Head of a caviar company. Won Olympic volleyball gold (1988) and bronze (1992), and captained the side in 1996.
Anita Defrantz USA
Age: 52 - member since 1986
Former IOC vice-president. Olympic rowing eight bronze medallist (1976). Vice-president of Los Angeles 1984 organising committee.
James Easton USA
Age: 69 - member since 1994
IOC vice-president. Runs a sporting goods company. President of International Archery Federation (FITA).
Dick Pound Canada
Age: 63 - member since 1978
Head of World Anti-doping Agency. Olympic swimmer (1960).