Can one of you nice folks tell me which of the autogenius files to load for ONLY the U. S. A?.Yhank you.

Not sure. I believe if you have a landclass addon for the US, you can put the .agn files from Autogenius in that texture folder, and leave the default .agn files in the Scenedb/world/texture folder, and Autogenius will only affect the US. I could be mistaken, but I think that's how it works.