The final was held in Montevideo in front of a crowd of 90,000. The tournament had certainly captured the public's imagination.
The kick-off was scheduled for 2pm, but the stadium gates had opened at 8am and by noon the ground was packed.
Uruguay took the lead, but after Argentina fought back, they had to overturn a 1-2 deficit at half-time to eventually win 4-2.
Their success was not repeated for 20 years as Uruguay did not participate in 1934 or 1938, troubled by players' strikes and resentful at the defection of European powers from the first tournament.
In 1950 the World Cup finals returned after a 12-year absence due to the war.
Uruguay were present for the first time since the competition's inception and continued their 100% record in Brazil.
Their success was remarkable for two reasons.