Simple logic tells you why they included the words “Citizen of the United States, at the time of the Adoption of this Constitution.” Without that they would of had to wait until John Tyler to have an eligible President, whose grandsons are still alive by the way.
Absolutely correct since there was NO Constitution until 1789, thus Citizen of the United States, at the time of the Adoption of this Constitution. However, the Birth Bozos have taken that to mean there is a separate category of citizenship other than Natural Born or Naturalized. BTW, until about a couple of years ago, this Birth Bozo theory was completely unknown.
Why then.....did John Jay write these words to George Washington?
Permit me to hint whether it would not be wise and seasonable to provide a strong check to the admission of Foreigners into the administration of our national Government, and to declare expressly that the Command in chief of the American army shall not be given to, nor devolve on, any but a natural born Citizen.