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There may well be more than three classes of citizenship.
Natural Born is not necessarily born in country. Natural Born citizenship arises out of the citizenship of the parents, and nowhere is there any requirement that the Natural Born citizen has to have been born in the country.
It is based on the conditions of birth, not the location of birth. A Natural Born citizen is one that is born a citizen due to his parents allegiance and citizenship, wherever that birth may take place.
Sorry. Jus soli is just as important as jus sanguines. The two together make a Natural Born Citizen with no other potential nationality.