Up until this year, you could tell which Treks were built in Wisconsin and which were built in Asia by the chainstay decal. They've sinced changed the decal to read something like "hand built in USA of domestic and foreign parts" which could mean anything. It seems like Trek is trying the blur the distinction as it has rapidly moved more and more of its production overseas over the last few years. I believe that they've even got an Asian-made carbon frame now.