I think that you covered this in your last statement. Rather than repeating the same code for so many countries you can just have a value in your db for these countries. You would add a recordset to the confirm pages that will select the user entered country from your table. You can then set a session variable, something like 'is_european' and set it to true.
Once you do this you would then be able to just use this session variable in your if statement rather than checking for each European country. This is just an overview of how you would implement this. Please post back with any questions that you have about any part of this and I will get more specific with any part you need help with.