Bill, GM bought Opel in the 1920's and gave it the technology to build most of the trucks that the German army drove to war in. They, (GM) also made a lot of money.
Ford built a similar plant in Japan, in the small town of Hiroshima. The reason why that town was #1 on the a-bomb target list was that all of the other targets had been flatened. Do you think that Ford may have had a say in why Hirosima was the last town to bomb? BTW, the name on that factory was Mazda.
Texaco sold oil from Indonesia to both the Germans and the Japs, but did it through subsidiaries not based in the US.
Kind of reminds me of a certain company that used to be run by our vice president.
As our British cousins would say: "Business is Business".
Of course there are no longer any British owned car mfgs. BMW owns Bentley, and Mercedes owns Rolls Royce. Or was it Volkswagon, I lose track of these things.