The United States
United States won in the 2012 london olympics
Yes Argentina have won a gold medal at the Olympics.
Nigeria won the silver medal in men's football and Brazil won silver in women's football.
Nigeria won the silver medal in the men soccer tournament in Beijing after losing to Argentina in the final with a 1-0 score.
ARGENTINA, second Olympics straight..in 2004 they won gold and did nopt concede a goal, while in Beijing they only conceded 2 goals..they have won 12 games straight in the Olympics now
At the 1960 summer olympics in Rome, Italy, Yugoslavia won the gold medal in soccer.
Mexico won the 2012 London olympics for soccer, impressively beating favorites brazil 2-1.