That number puts Hyundai above all other automakers in the United States. Ford and Chrysler don't have exact figures, but estimates for the two manufacturers puts them both below 80 percent as those two automakers assemble many of their popular vehicles in Canada and Mexico. General Motors says between 60 and 70 percent of vehicles sold in the United States are built here.
The numbers may be quite interesting, but of course they don't tell the whole story. The Big Three domestic automakers produce a much greater volume of vehicles in the United States when compared to Hyundai. For example, if GM built 66 percent of the vehicles it sold here in the states in 2009, it would triple Hyundai's projected U.S. output for next year.
These figures are also based solely on final assembly. This is important to note because the U.S.-based automakers routinely manufacturer portions of the car in the United States, but the final product might be assembled outside the country. Hyundai, on the other hand, does final assembly on 80 percent of its models, like the millionth vehicle built at its plant in Alabama seen above, right here in the U. S. of A.
[Source: CNN Money]