The World Cup kicked off today with a 3-1 Brazil victory over Croatia.
The U.S. plays for the first time Monday.
Earlier Thursday, violence erupted in Sao Paulo as police clashed with protesters around 11 kilometers from the stadium.
Critics are furious with the Brazilian government for spending $11 billion on the World Cup instead of low-income housing, hospitals and schools.
Fans in Chicago are gearing up for the games.