http://www.rushmypassport.com/blog/2009/04/travelers-to-canada-mexico-or-the-caribbean-carry-us-passports-or-else/ US passports are required for travel to Canada, Mexico and the Caribbean after June 1st. What happens if you don't have one? US passports. Wed, 08 Feb 2012 22:52:00 +0000 hourly 1