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No. The 90 days do not pause in Canada, Mexico, or nearby islands. Source (Ctrl+F, "Trips to Canada, Mexico, or nearby Islands." When you come back to the US, your leave-by date is the same actual date as it was when you first entered the US; your whole trip, from when you first enter the US until you last leave the US, must be at most 90 days unless you left North America in the middle.