It depends on what branch of GM you are talking about ,what division, and for what purpose it is intended.
for a large part most of the car/truck/suv is farmed out to supplier companys that search out the cheapest local bidder.
The question is really to broad to give you the intended answer with out more exact information
Most of the steel in US produced autos is imported from China.
1989
General Motors's population is 2,012.
Dan Akerson is chairman of the general motors
General motors is for profit company.
Cadillac is made by General Motors.
Daniel Akerson is the chairman and CEO of General Motors.
William Crapo Durant is the founder of General Motors.
General Motors belongs to the stockholders. It is an independent company.
General Motors International Operations
General Motors Motorama was created in 1949.
General Motors Egypt was created in 1983.
General Motors Egypt's population is 1,300.