It has been 32 years since the USA last hosted the World Cup in 1994. Back on home soil at Los Angeles Stadium, Inglewood, it took just seven minutes for the team to score their first goal - but it was not through their own merit.
American striker Christian Pulisic managed to elude two opponents before shooting the ball - which bounced off Paraguay's Damian Bobadilla, who then happened to direct it into his own goal.
The USA's next goal came from Folarin Balogun in the 31st minute, shortly after they had an earlier goal disallowed.
At that point, Paraguay seemed to give up, while the USA continued to create more chances. Just before the end of the first half, they struck for the third time - again with Balogun as the scorer.
For Paraguay, it has been 16 years since they last qualified for the World Cup. But it may not have been the comeback they had hoped for. Paraguay's only goal came in the 73rd minute.
But the game wasn't over then. Before the final whistle, USA's Giovanni Reyna scored the team's fourth goal.
The USA will face Australia in their next match, while Paraguay will face Turkey.
