Again I refer to United States v. Wong Kim Ark, 169 U.S. 649 (1898)
The constitution nowhere defines the meaning of these words [citizen and natural born citizen], either by way of inclusion or of exclusion, except in so far as this is done by the affirmative declaration that 'all persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.
The Court addressed the so called Common Law (Vattel as precedence.
It thus clearly appears that by the law of England for the last three centuries, beginning before the settlement of this country, and continuing to the present day, aliens, while residing in the dominions possessed by the crown of England, were within the allegiance, the obedience, the faith or loyalty, the protection, the power, and the jurisdiction of the English sovereign; and therefore every child born in England of alien parents was a natural-born subject
Natural born subjects to a king or a queen? We are not subjects to kings or queens in the United States. We have no royalty and therefore no obedience or allegiance to them. We are citizens in a representative republic.