Where is that defined in the Constitution?
It isnt defined in the Constitution...but
In Inglis v. Trustees (1830) and Elk v. Wilkins (1884), the Supreme Court ruled that a child born on U.S. soil, of a father who owes allegiance to a
sovereignty other than the United States, is not a U.S. citizen at birth; the citizenship of such a child is that of its father, not its place of birth [20].
Consequently, the U.S.-born child of a foreign-citizen father cannot be a natural born citizen [41].
Thus, the modern-day consensus opinion (that birthplace alone confers natural born citizenship), though widely held, appears to be an assumption, not
settled law or established
Reason 5: Supreme Court precedent
In Minor v. Happersett (1874), all children born in the United States were divided into two categories: those whose parents were U.S. citizens, and
those whose parents were not. The Court used the term “natural born citizen” only in reference to members of the first category. The Court doubted
whether members of the second category were even citizens, let alone natural born citizens [22]:
The Constitution does not,
in words, say who shall be natural-born citizens.
Resort must be had elsewhere to ascertain that. At
common-law, with the nomenclature of which the framers of the Constitution were familiar, it was never doubted that all children born in
a country of parents who were its citizens became themselves, upon their birth, citizens also. These were natives, or natural-born
citizens, as distinguished from aliens or foreigners. Some authorities go further and include as citizens children born within the
jurisdiction without reference to the citizenship of their parents. As to this class there have been doubts, but never as to the first. (Minor
v. Happersett, 1874).
Since a child acquires “natural born citizen” status only at birth [07], and since the Supreme Court (in Minor v. Happersett) “distinguished” natural
born citizens from aliens or foreigners, it follows that natural born citizens are persons who, when born, are not aliens or foreigners, i.e., are neither
foreign-born nor foreign citizens/subjects.
Presidential Eligibility Tutorial http://people.mags.net/tonchen/birthers.htm
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Well that’s the problem now isn’t it Not defined and the recent USSCs refused to take cases on Obama. From the 1700s we have Vattel’s definition and the letter from Jay to Washington.
now waiting for your definition and source.