Supranational Groupings
A number of separate supranational groupings of countries exist, and membership in some of these groupings may involve multinational agreements and treaties in which member countries agree to some degree of reciprocity regarding voting rights. Some individual countries are members of more than one supranational groupings, and some supranational groupings of countries are members of other supranational groupings of countries.
Read more about this topic: Right Of Foreigners To Vote