"if Deere put legal pressure on Mahindra, and if Mahindra pulled the advertisements, then Mahindra probably crossed the legal line in HOW they used the representations of JD. "
Not necessarily. few years back JD used their might to intimedate several importers of chinese tractors to change colors, Agracat being the largest at the time, but Lenar was also named. These tractors did not copy JD green chassis, hood and fenders with yellow wheels, they were easily identifiable as being different with thier black chassis, Look how many walking fingers you see for yellow pages, similar but different. None of these companies had the money to fight.
Mahindra may well have been OK in this ad, (I didnt see the ad and I am not a lawyer). Could be they just didn't want to into battle with such a large corporation.
As far as US content. I could probably build a case (no offense CIH) that the chinese tractors brought in by small importers have a larger US component included in the sales price than many formerly made in USA brands now sold. Between the more involved assembly and US based quality control operations needed and US funded warranty operations, there is a lot of value added stateside for these tractors.
That said, I do buy American cars and trucks (with considerable imported componentry) so long as I don't have to pay extra for it.