”This class of citizen has no other possible citizenship.”
This.
Threadwinner, right there.
From Minor vs Happersett:
“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.”
Even basic citizenship was being called into question here regarding those born “without reference to the citizenship of their parents”, let alone an opinion being made allowing for natural born citizenship status to those not born of US citizen parents, emphasis on the plural.
When determining the eligibility for the highest office in the land, you want the highest degree in confidence in the citizenship (and presumed attendant lack of divided loyalties) to country to be found in a citizen who is such because of their birth to people who are themselves citizens of the same nation.
Logically speaking, this isn’t hard, folks, and Minor vs Happersett addresses it pretty clearly, from where I’m sitting.