i think mms is right with one qualification--there are plenty of people in the US who are into detroit techno and chicago acid house, etc. They're just not "rave" types in the same way that you have them over there.
sure are they idm ppl either?
as obviously all that stuff was a huge influence on all those so callled idm types, you can hear it in al their early music, warp influences album and rephlex releasing a futuresound (chicago) records comp really early on etc, there wasn't any decision to break from that music as such from uk artists merely to reflect it back from the various local scenes/ artistic perspectives, auteurist or otherwise in the uk i think. Whilst alot of US fans of that music came in when trent resnor's label and astralwerks licenced aphex muziq and squarepusher records, and they didn't really have a knowledge where that music had developed from, most of em anyway. Neither did they have the network of raves and drugs. You could go to a plymouth union street club and see aphex playing next to the prodigy and t99 in a rave at one point.
The deal with US fans was totally sealed with 'come to daddy' which is was really playing in the backyard of nine inch nails and all that, with quite alot of pop muscle, the metal guitars the mum scaring vocals and the metal fan friendly mtv baiting video.
As it was said down thread, a shit load of this is dancing material, - early black dog, aphex, squarepusher, b12, cylob, 'innovation in the dynamics of acid' rephlex stuff, mark pritchard - who has done loads of stuff over lots of labels in various styles, you can shake a leg to it all. Most of those guys seem to be moving back to more simpler stuff now anyway.