I don’t know, but the article mentions the threat of unions in the South may be a factor. It also says the lack of a tariff between the US and Mexico is a factor.
Mexican auto workers - $5/hr
US non-union auto workers - $15-20/hr
(rough numbers but you see the difference)
Plus I’m sure the costs of EPA, OSHA, etc type stuff are far less.
South Carolina is right to work, and has the fewest unionized workers in the US....that article is BeeEss for even mentioning that
Most supporters of Free Trade lie as bad as their brethren in the Global Warming Hoax crowd (the two are hand in hand, right Al Gore?)