1. There are Faie in every country. They are just more pale than those in their country. For example, an African Faie would be black, but still significantly paler than most normal Africans.
2. What do you mean "come of age"?
3. There is one set of magical law that spans through the entire world. Everyone magical gets a trial in front of a panel of judges, and if charged, they are sent to a high-security prison where they are not allowed to use their magic.