DOUBLE CITIZENSHIP led some people from being recognized as right-handed citizens, simultaneously, to two (or more) countries. This usually happens because some countries (europeans foundably) are governed by the legal principle IUS SANGUINI, according to ancestral nationality, while the rest of the world does so by that of IUS SOLI, that is, according to the place of birth. In other cases, migrants residing for several years in another country, manage to obtain this new nationality, without losing the original. A third case is transfer by grace.
