Vattel didn’t have to use the phrase NBC. He was writing about being a native and having natural citizenship at birth, BOTH of which were contingent on being born in the country of citizen parents (but more strictly of a citizen father). Thus, native-born meant the same thing, to be born in the country of a citizen father. In Minor v. Happersett, the Supreme Court tells us this is the only definition of natural born citizen for which there is no doubt. Since this decision occurred AFTER the 14th amendment, they are telling us that the 14th amendment is not sufficient to make a person a natural born citizen ... otherwise, it would have removed the doubt of being born in the country of noncitizen parents.
See post 134. Vattel was writing philosophy, not law, and taking one sentence from his book that used ‘native’ and ‘indigenous’ and turning it into the one and only accepted legal definition of NBC is dishonest.