You never know if president-elect Donald Trump is bluffing, but when you have billions of dollars on the line, you have to take him seriously. So car companies took notice, when Trump announced a plan for huge new tariffs in a social media post before Thanksgiving.

A 25 percent tax on imports from Canada and Mexico would have a major impact on the car industry, which depends heavily on cross border trade.

Trump's tariffs could have huge consequences for the people who make cars, and the people who buy them.

Even if he's bluffing, he has other big plans to shake up the auto industry.

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