There is currently a plan to create off-shore islands specifically with the concept that these would be officially outside the US (more than 12 miles offshore) but enable the creation of technology "startups" that would be funded by US wealthy entrepreneurs.
Here's a link on this concept, titled Blueseed:
Probably not what you had in mind--but these will possibly help people eventually become U.S. citizens
Here's a video on this concept:
[ Edit: Edited on 17-Aug-2012, at 21:31 by Calcruzer ]