Last time I checked they were, but that doesn't mean that the money will stay in the US and not go to the company after costs. The only money that really stays in the US from the Toyota, Honda, Hyndai and whatever other import companies in the US and Canada is the money to pay the workers, the Rent or Lease of the buildings (if applicable) and the utilities, after the US section of the company, the money is transfered back to the higher management back in Japan. Its a Japanese company, the headquarters will stay in Japan. It is no more domestic then an older Toyota that was made in Japan and sent to North America. Just because the VIN says its made in US or Canada, it doesn't, mean its a Domestic.
As a side note, I saw a bumper sticker yesterday that said "**** your Jap car, Patriotic my ass", I think it seems fitting.