What's the difference between the two? And if you say they are one in the same cite your source - anyone?
I'll answer my own question since no one took the bait. ;-)
The answer is under all of your noses. In Article two, section 1., of the U.S. Constitution it mentions two types of citizens. Verbatim, ..."a natural born citizen or a citizen of the United States"....
That's two distinct U.S. citizenships. Native born citizens are citizens of the United States but they are not natural born citizens as stated in the U.S. Constitution.
The third is a foreign citizen or national that becomes a U.S. citizen through the naturalization process.
;-)
You exclude a highly relevant section.
No person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President...
Please don't descend to quoting out of context.
The "Citizen of the United States" you refer to as a third category is part of the phrase "Citizen of the United States, at the time of the Adoption of this Constitution."
None of them are around anymore, so this phrase has become inoperable due to the passage of time, leaving us with the two classes of citizen.