Make it so if a user attempts to register in a country other than US, a message will pop up saying "Sorry, we are currently only accepting US players. Please check back soon as we wish to expanding our user database and allowing more countries."
I have an application in php which I create to determine the country from the ip. I did this before for all the countries. I can do this again for you and a specific country again. We shall not be scraping any site's data but shall be using our own in house IP solution , which is the way IPs originally work.
I can give the application for all the countries to you for 80 Dollars. But this one country part can be given away for 35 Dollars.
Thanks for your time. Regards