It is a passport. A passport is an internationally recognized travel document that verifies a person’s identity and nationality (what country someone is from). A passport is required to enter and leave most foreign countries and each country has its own passports. Only the U.S. Department of State has the authority to grant, issue or verify United States passports. The American team members have their passports. They need passports to enter Brazil as well as to return to the United States.
Clue #1 This one belongs to someone from the United States.
Clue #2 It has a person's name, photo, birthdate and other information in it.
Clue #3 You can get stamps inside of it for each country you visit.