Is it theoretically possible to have the following feature?
Yes theoretically there are several Geo location API’s out there, the reliable ones you have to pay for, such as MaxMind.
The latter part sounds strange, if you want the same content, then just use language files.
If for some crazy reason you want to serve up different content per country, it would be quite the undertaking, you most likely would want to create your own API or custom page per country, you dont want a billion if statements.