The jobs for the US semi companies are spread around the world. Most of the manufacturing is in Asia. There are still some fabs and design work done in the US, but from what I see, it is diminishing. It would be interesting to see the numbers and trends, but I don't think we can get that information.
Would also be VERY interesting to tabulate where the fab and packaging jobs are by region.
Nice bragging rights for the U.S. that U.S. flagged companies have half the worldwide revenue... but where does that value get distributed through jobs?