Not only Ford, but Chrysler and GM have numerous overseas plants. This was started many years ago to accommodate the overseas market. The cars manufactured in these plants normally never come to the USA, but remain where they were made or shipped to a close market in that area. There are, however, many parts and accessories built or manufactured overseas for domestic automobiles. They are shipped and installed by American workers at American plants.
In my opinion, labor unions are largely responsible for the work being farmed out to a foreign company, or foreign plant. When union workers scream and holler for more money prices for the produce go up, sales go down because nonunion workers can no longer afford to buy the product.
Looking back, I make much more today than I did 50 years ago, but even in those days, and with my humble income, I could afford to buy a new vehicle every couple of years, that was before the union demanded that incompetent workers be promoted and paid based on seniority. I think many of those worker's can see that they shot themselves in the foot, no job and no pension today, and they run the business out of the country.