>>nicbou+(OP)
Kudos on the nice UX for dropdown with countries. I wish more websites do it. Usually, it's "United States" at the very top, and 194 other countries in a loooooong list.
>>melx+f3
I use navigator.languages to guess the user's possible countries. It's not perfect, but the cost of guessing wrong is low. I've used the same technique to show currency conversion tooltips in the content.