It’s important to note that Mexico and Canada have unions.

Musk and his team has been very successful at surpressing unionization. They quickly gets rid of those that try.

The Japanese and Korean makers try to keep people placated so that they don’t think about unionization. Or in Hyundai’s case, using child labor and getting caught. In the South, some people are too ignorant to understand what the benefits of unions are which is why it’s a popular destination for manufacturing jobs.

Volkswagen Auto Group has two separate unions, a minority UAW and a competing American Council of Employees specifically at the Chattanooga plant. The others are probably not unionized YET.

Unionization gets more popular as more conpanies try to extract more productivity without proper compensation.