The same way everyone else is a natural born citizen.
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Ah, well...there you have it! The framers definition for a natural born citizen included people born with allegiance to a foreign nation and as such, the only person in government required by the Constitution to be NBC is that of the Commander in Chief of the armed forces. Of course, all citizens are natural born citizens, including Ahnold. Brilliant!
/s
think you left out a word:
The framers definition for a natural born citizen included people NOT born with allegiance to a foreign nation ...