Update: The US passport card can now be expedited by mail through the US Department of State, with emergency processing available through some (but not all) regional passport agencies.
‘On June 1st, 2009, the rules governing travel between the United States and Canada, Mexico and the Caribbean will change. Currently, only air travelers need a passport to re-enter the United States-land and sea travelers can use a photo ID (like a driver’s license), and proof of citizenship (such as a birth certificate).
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