He set 39 world records, won 18 Olympic Gold Medals and 26 world championships. There is no doubting Michael Phelps' dominance in the sport of swimming. At the 2008 Olympics, Phelps broke an Olympic record by winning 8 gold medals in a single games. He is the greatest swimmer and Olympic athlete in history.
Michael Fred Phelps (born June 30, 1985) is an American international swimmer who has, overall, won 16 Olympic medalssix gold and two bronze at Athens in 2004, and eight gold at Beijing in 2008, winning more medals than any other athlete at both of these Olympic Games. He has twice equaled the record eight medals of any type at a single Olympics achieved by Soviet gymnast Alexander Dityatin at the 1980 Moscow Summer Games. His five gold medals in individual events tied the single Games record set by compatriot Eric Heiden in the 1980 Winter Olympics and equaled by Vitaly Scherbo at the 1992 Summer Games. Phelps holds the record for the most gold medals won in a single Olympics; his eight at the 2008 Beijing Games surpassed American swimmer Mark Spitz's seven-gold performance at Munich in 1972. Phelps' Olympic medal total is second only to the 18 Soviet gymnast Larisa Latynina won over three Olympics, including nine gold.
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Your answer is United States. Source: Wolfram|Alpha