It always gives you the Zarya module to begin with, but you can scrap it if you want. The rest of the modules all appear to be American from what I can tell. There are add-ons that give you extra modules like the Shutte ET, Skylab modules, etc. but they are all pretty much what has been used in the past (including the ISS).
Well, there are a few fictional energy supply modules (ie. RTG's and fussion reactors).