And in that section you will find their requirement for “exclusive” allegiance. It is called “The Expatriation Act of 1868” and is the statute that governs & requires the renunciation of ALL foreign attachments. A natural born citizen never had any attachments to a foreign nation, a naturalized one did. Get the picture?
Sorry, USC Title 8 section 1401 does not even contain the words “exclusive” or “allegiance”
The Expatriation Act of 1868 is codified in Title 8 section 1481. In subsection A, there are only two ways to be a citizen of the US. Either by birth or by naturalization.
Section 1101 specifically defines naturalization as a process that occurs “after birth”.
Therefore, if by the conditions of one’s birth, one qualifies as a citizen of the US, then one has never been and never needed to be naturalized. As such, they are a natural born citizen.
Further, the authority for the establishment of these rules is vested with Congress as an enumerated power according to Article 1 Section 8 of the Constitution.