Mike, why does that really matter??? There is no such thing as a truly 100% american car anymore, not that there is anything wrong with that. All of the auto makers are global companies now, they all make parts all over the world. Thats just the way it is. It just so happens that two of these companies are based here in the USA. And some people choose to buy from those companies.
The way i look at it is this in the case of trucks. There are five full sized trucks out there currently. All 5 are plenty capable, and they are well built and reliable if taken care of. Like i said before i also dont see where any one stands out in reliability over the other, they all have thier problems( although toyota owners like to think they are immune) and will have thier problems. IMHO it all comes down to preference.
When i bought my truck last year i shopped all 5 full sized trucks. I spent almost three months shopping trucks and drove a bunch of them. although my preference is to buy from an American company my choice came down to two, the Nissan and GM. One of my reasons for narrowing it down to these two is both buy products from the company i work for(Bose), they generare a lot of business for us, my bonus is better because of them. Also Toyota and Dodge had no interest in selling me a truck, lowballing the trade bigtime and saying the sticker is the price isnt going to compete in my eyes. I never really concidered the Ford because i dont like how they drive, one test drove of a f150 didnt change that perception. In the end it came down to me feeling much more comfortable with the GM product. The Chevy felt more solid and better put together and the dealer was much better to do business with. I for one dont regret my choice one bit, the truck has been flawless, other then the accident where i got wacked on the rear wheel and fender and it spent a week + in the shop getting fixed( i can thank my ins co for that delay). While my truck was in the shop i got to drive a titan that my ins co had rented me. Driving the Titan for a week and a half only confirmed in my eyes that i made the right choice.
If i had to do it again today i would get the same truck i have now( but it would be the new body style) for sure.
Mac, thanks for the kind words. I could not be more pleased with my my truck. I test drove the new 07 GMC last month when I went car shopping with my Sister. She wants to dump her turd BMW X5 and i think i have her convinced on the new Acadia. She drove one and was totally impressed with it. She has driven only german cars for a long time and wanted another. Im totally impressed with the new body style as i was with the Acadia. I think GM is on the right path for sure. the new stuff that is coming out is impressive.