Strange. Who buys these things? Outside of the trucks, I very rarely see them on the road.
I should think a state like Tennessee would be one that you'd see a fair number of domestic cars - I know I still do see quite a few in Missouri on the rare occasions I visit there (though I have to admit I can hardly recognize the cars anymore, or tell the foreign ones from the domestic imitators).
Most common cars on the road are Japanese. Flashy people go for German. Most domestic cars I see are older and driven either by olds, blacks, or those unable/unwilling to get a newer ride. Old rich white people do love shiny new Caddys and Lincolns though. Hicks are obsessed with their domestic trucks. Plus, there are still quite a few Suburban/Explorer mommymobiles around, but high gas prices have made them much less popular than they were 5 years ago. All in all, I'm surprised Ford has weathered the last decade as well as they have, with improved durability of all cars and the fact that theirs are pricey for what they are.