obama was the first mexican to win
the american athlete James B.Connolly 1896
Hasely Crawford was the first Trinidad and Tobago athlete to win a gold medal. He won the 100 meter dash at hte 1976 Montreal Olympics.
Eric Heiden was the first person to win five gold medals in one event.
Brittany Ann Mickelson
Cathy Freeman became the first Aboriginal athlete to win a Commonwealth Games gold medal when she won the 4x400m relay at the 1990 Games.
Mariel Zaqunis on the U.S.A. won the first gold medal of the 2008 summer games in the individual Sabre in fencing.
As far as the Olympics goes, Charlotte Cooper won a gold medal in the Ladies Singles in tennis in the 1900 Olympic Games in Paris. She was the first woman in history to win an Olympic gold medal.
Gold, Silver and Bronze.
That was Yvette Williams in long jump at the 1952 Games in Helsinki.
John Taylor USA 1908 men's 4x400 metres
Al Oerter (Discus)
Michael Johnson (USA).
The first athlete representing South Africa to win an Olympic gold medal was Reggie Walker who won the 100 meter dash event at the 1908 Games in London.
Jesse Owens was the first black man to win the 100 meter dash. In 1936 he went to the Olympics in Germany and was the first American athlete to win 4 gold medals.