1) Canadian Visitors to U.S./U.S Visitors to Canada
Be prepared to verify your citizenship (place of birth) and IDENTITY (photo i.d.) with such documents as a Birth Certificate, Passport, Drivers Licence, NEXUS/FAST card, Naturalization Certificate, Visa or Green Card, Baptismal Certificate, Citizenship Card, Record of Landing or Permanent Resident Card.
If you are traveling with children, you should carry identification for each child. Divorced parents, who share custody, should carry copies of the legal custody documents.
Travelers under the age of 18 and unaccompanied by a parent need a letter of permission form a parent or guardian.