Rolls Royce have got NOTHING to offer to American technology.
That'll be why NASA are spending American tax dollars involving RR in SST design studies then, and for that matter why Boeing is using a RR Trent 1000 in the 7E7 Dreamliner as the lead engine, RR is a 40% partner in developing the F136 engine for F-35...
The US leads the world in most things aerospace, and has every reason to be proud of that. But that sort of petty statement, disregarding that the rest of the world actually is somewhat bigger than the US on it's own, and regularly does it's own thing quite well, is part of the reason that the rest of the world so regularly chooses to treat the USA with contempt.
G