You are almost there, you just need to add the 'based on session variable value' condition to the ones you have now. You would specify the same session variable and '=' to US.
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.