Canadian travel to the United States has dropped sharply over the past year, and the impact is now coming with a price tag.

A 30% drop in Canadians crossing land borders into the United States is hitting Detroit businesses, tourism officials say, as political tensions and currency exchange rates keep visitors home.

During the biggest travel week of the year, the chance of flight delays paired with declining gas prices in many states prompted many families to drive to their Thanksgiving destinations. However, gas ...