Uh, when he or she has dual citizenship. Ever heard of it?
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No, I haven't heard of dual citizenship (pay no attention to post #1). /s
So, how can one be a "Natural Born Citizen" of the U.S. and be born the subject to a foreign crown as well?
“So, how can one be a ‘Natural Born Citizen’ of the U.S. and be born the subject to a foreign crown as well?”
The same way everyone else is a natural born citizen.