Final answer:
In the Harry Potter universe, the United States Quidditch team was knocked out of the 2014 Quidditch World Cup by Brazil.
Step-by-step explanation:
The student asked, "Who knocked the United States out of the 2014 Quidditch World Cup?" In the 2014 Quidditch World Cup, jotted down in the fictional universe of Harry Potter created by J.K. Rowling, the United States was eliminated by the Brazilian team.
This event was detailed on Pottermore, which was an official Harry Potter website providing backstory and additional information about the wizarding world.
As Quidditch is a fictional sport from the Harry Potter series, this question falls under the category of Arts, particularly literature, rather than a non-fictional sports event.