Can't renew I94 visas by crossing borders
Always been rumours about being able to extend some travels in the US by crossing into another country.
"You cannot renew your I-94 entry by travelling to Canada, Mexico or adjacent islands in North America. If you enter the United States under the VWP, travel to another country in North America, then try to re-enter the United States, you will not be issued a new I-94 entry. Your second entry into the United States will be linked to your first I-94 entry and you must still depart the United States by the expiry date of the first I-94 entry. "
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