This phenom is not just limited to tractors or cars. Highbeam touched on the fact that you can hardly buy any clothes made in America any more. Look at the electronics industry and see where that stuff is made. And as rdnl said, "you are preaching to the choir".
I am an American mold maker. I machine all my components, mill, lathe, grind, EDM, polish etc... I buy American made steel from a company back East and American components such as Allen socket head cap screws, Miller hyd cyls etc ... at least I think they are American made. Everything else I make myself and heat treat locally. Well, this is came to a screeching halt.
My prices were not competitive with off shore mold makers from China, Korea, Indonesia, India Hong Kong, etc. Both myself the engineers I dealt with had our hands tied because the decision was not up to them anymore. The corporate bean counters were making the decision where to have this tooling made ...based on PRICE and not necessarily capability, reliability, warranty, service or reputation anymore. And guess what? Their product is pretty good now.
I sold my business in 1996 and retired. It was a large manufacturing business with 35 toolmakers and a 27,000 sq ft plant to go with it. Then I opened a small garage business. I only do occasional work and only for those who want to pay the prices I charge. I don't actively look for work but some of my old customers call me to make molds for them.
I got them back and bought a really good Chinese tractor.
Now I have modified it so much it's more American than most others.
