If Europe is so confident in their products, they believe that the people in Europe cannot become more powerful than the median Government in Europe with American made goods...
Why do they limit American Cars or Blockade them ?
Why don't they want a Government in Europe to have America's premier technologies exported to them ?
Why do they want to blockade or limit American machinery that is made for various industries ?
Why do they want to limit or blockade American culture, such as food, media, art and so on ?
Usually countries blockade foreign goods to protect the superiority of the Government over the local population, by denying the civilians access to the better foreign goods.