I fear no cigar on this one.
“It is quite clear, then, that there is a citizenship of the United States, and a citizenship of a state, which are distinct from each other, and which depend upon different characteristics or circumstances in the individual.”
Slaughterhouse case
There was no such thing as a “citizen of the United States” before the 14th amendment. There were Citizens of the various states, “Citizen of Pennsylvania”, “Citizen of Virginia”, etc.