The passport requirements for land and sea travelers returning to the United States from Canada, Mexico, and the Caribbean have been extended to a undetermined date. USA Today reports that land and sea travelers must have their passports by sometime in 2009. The new restrictions were expected to take effect in the summer of 2008.
As of January 31, 2007, an oral declaration of citizenship will no longer be enough to re-enter the country. U.S. and Canadian citizens will need to present either a WHTI-compliant document, or a government-issued photo ID, such as a driver’s license, plus proof of citizenship, such as a birth certificate. Examples of WHTI-compliant documents are a U.S. passport, passport card, or the SENTRI, NEXUS, FAST and U.S. Coast Guard Mariner Document.
For more information, visit the State Department Web site.

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