Yes, other markets on the planet are marginal. Never mind that the EU is actually larger. In many metrics than the US. It's not even in the "funny" pages of us websites, so apart to a minority of educated readers, it doesn't even exist. And let's not even start about the rest of the planet.
It can't actually be used to verify anything. As implemented, it just reports whatever you entered. It's just as valid as those birthday fields on websites that cater to users that share a 1st of January birthday.
This sounds like it requires some work.