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From the NAFTA here is your answer:
North American Automobile Trade AssociationImport Tariffs"Under the North American Free Trade Agreement (NAFTA), vehicles thatare assembled in the United States or Canada do not have any importtariffs. This is indicated by a 1, 2, 4 or 5 as the first digit of theVIN."http://www.naata.org/new%20files/import1.html