Jim,
The fact the car is built in Mexico should not be a concern. It is designed in Michigan, and I am told much of the management in the Mexican plant is American. Much of the content is American as well. And when a Fusion or Milan is sold, it supports a domestic car company and helps keep many Americans employed.
On the flip side, buying a Honda or Toyota that is produced in this country has a benefit to the local workers, local suppliers, the American HQ of the foreign car company, but that is it.
I see buying the Ford as being better for the domestic economy and workforce than buying a domestically built Honda or Toyota or Nissan.