Because realistically, most of those dual citizens started out as foreigners and were eventually naturalized as a consequence of pursuing an academic career in the US.
My guess would be that a large number of dual citizens obtained their citizenship in the course of their scientific work. It speaks to the training problem we have.
Re:The future of the postdoc
by omginternets on Tuesday November 17, 2015 @03:47PM
(#10583837)
Because many foreign cultures value education more than the U.S., overall.
Why on earth would you group dual citizens in the same category as foreigners?
Even if 100% of the faculty are dual citizens (Americans + something else), it would still be 100% American.