Symmetry magazine just had an article on the US contribution to the Large Hadron Collider at CERN in Geneva. The LHC is the colliding proton rings that discovered the Higgs Boson that was announced on July 4, 2012.
Of the 6000 physicists at the LHC, 2000 are from the US.
They come from 96 US Universities and Labs, and 33 states.
They compose 23% of ATLAS and 33% of CMS personnel.
Since 2008, 230 US doctoral degrees have been generated at the LHC.
The US provided one-third of the cost of each detector, about $165 million to each. A lot of this was built in the US, funding US hi-tech jobs.
The US also contributed $200 million to the accelerator.
The US contributes about a third of the cost of running the detectors.