s31523 writes: "It may come as a surprise to some, but in previous years travel to/from the United States to/from neighboring countries did not require a passport for re-entry into the U.S. Not anymore, as new regulations go into effect today that will require a passport for travelers entering the U.S. from neighboring countries like Canada, Mexico, and various Caribbean islands. U.S. territories are the only exception. The new rule even applies to children, as noted on the U.S. Dept. of State website."
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