Ambiguity in what counts as American-made vehicles

Speaking of imported vehicle parts, June Kim and Neal Boudette, for The New York Times, highlight how some vehicles are technically American-made but use mostly imported parts and others are technically imports but use mostly American-made parts.

A vehicle like the Toyota RAV4, assembled in Canada with 70% American parts, would technically have to pay a 25% tariff. What counts as American-made?