Even if a automobile part for assembly is manufactured in the U.S., the subparts may be sourced overseas. This makes it extremely difficult to pinpoint the country of manufacture. Toyota Siena is 90% sourced with US and Canadian parts according to the U.S. National Highway and Traffic Safety Administration. The Ford Mustang 2005 by contrast uses 65 %US and Canadian parts according to NHTSA. There is a publicity war between the US makers and the Japanese with commercials arguing about who is more American. According to the Japanese Automobile Manufacturers Association $28 billion is the amount of cumulative investment in N. America and $45 billion is the amount of annual purchases of parts, so that 67% of the Japanese brand cars sold in N. America are made there. A graph from National HighwayTraffic Safety Association shows the Average percentage of auto parts made in the US and Canada for cars sold in N. America. It shows 2 interesting things. 1. That the US makers GM and Ford are closer to 80% and the Japanese makers Toyota and Honda are about 70%. So American makers still have more American content. Note though that Nissan is only around 54 % domestic content, significantly lower. Its always been a much weaker competitor than Toyota, and its sales recently have been sluggish in the US. The Koreans are not shown here but its quite possible that their content is closer to Nissans than to Toyota or lower than Nissans. So all foreign plants may not be the same. Notice the change in Toyota from 52% domestic content to 70% domestic content, from 2000 to 2005,an 18% jump which could only result from a deliberate strategy anticipating the controversy of who is truly American and who isn't. 2. In contrast GM has definitely shifted from 92% to 80% and rapidly moving in the opposite direction than Toyota. The sea change currently underway in the American auto parts industry is in the background, with Delphi looking to increasing manufacture and sourcing overseas particularly Asia (China, India etc), to bring down costs and be competitive in a globalizing auto parts industry. In the future as Delphi shifts overseas and GM procures from China and India one could see a continuing rapid shift to higher overseas content to add the cost savings directly to GM and Ford's bottom line. ...