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.
General motors is for profit company.
Dan Akerson is chairman of the general motors
General Motors Canada was created in 1918.
General Motors International Operations
General Motors Egypt was created in 1983.
General Motors Egypt's population is 1,300.
General Motors do Brasil was created in 1925.
General Motors Motorama was created in 1949.
The population of General Motors Canada is 12,000.
General Motors belongs to the stockholders. It is an independent company.