For example: the 2015 Ford Fiesta was built in Mexico with 15% of the parts coming from the U.S. and Canada and 60% from Mexico.
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How do they make a car with only three quarters of the parts they need?
I’d guess the balance is from China, Vietnam, Thailand, etc.
Back around 1990 a lot of auto parts component manufacture started moving from US to Mexico. Then around 2000 that stuff was sent to China and the displaced Mexicans started heading for the US border.
China has walked up the price scale and you’re seeing things go the next low buck paradise like Vietnam, etc.
Leni