it's not so much about registration as it is about being logged in.
they could be registered, but not logged in.
If they are not logged in,the default is set to US, if they are logged in, then it will use what ever country they registered with.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.