that you are referring to. (which likely stems from a misunderstanding of the Organic Act of 1871)
The phrase "United States" as used in the 14th has been determined by the SCOTUS to mean the government of the several States under the Constitution.
Since the amendment specifically and unequivocally states that the "citizenship" conferred therein applies only to those subject to the jurisdiction of the United States, it is clear that if you are claiming "citizenship" under the 14th, what you are really claiming is access to privileges granted by Congress.
There's nothing in there or even implied there about corporate personhood either for the United States or for any "citizen."
Those who are "subject" to the jurisdiction of the United States in a geographical sense, would be people living in the District of Columbia, (not because of any incorporation act, but because of Article I § 8's clause about 'exclusive jurisdiction') as well as anyone living in any territory, organized or unorganized, that is not a State.
Likewise, if you are on federal property, while you are on that property, be it on land, or by sea or air, you are under the temporary territorial jurisdiction of Congress. This has nothing to do with being incorporated or being an artificial person. It has everything to do with Article I § 8.
There are also issues of subject matter jurisdiction, but those are much more limited and much harder to define, as they are likely even more transient than territorial jurisdiction in many respects.
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