“I think there are a good many rich people who inherited money and invested overseas.”
Then you have not studied wealth in the United States. Over 90% of the “wealthy” are 1st generation business owners. They ARE the job creators. See http://www.ncpa.org/pdfs/st289.pdf
By population, yes, by money, no, and it seriously depends upon how one defines "wealthy." Four of the top ten are Waltons. Packard, Pew, Jones, Rockefeller, MacArthur... the big foundations that exert the most political influence almost all represent inherited wealth.