So a "Citizen of the United States, at the time of the Adoption of this Constitution" is not the same as a "natural born Citizen".
And to be elected to Congress one must be a "citizen" as opposed to a "natural born Citizen" to be elected President.
Why do you suppose the different terms were used. Were the founders merely sloppy?
“a ‘Citizen of the United States, at the time of the Adoption of this Constitution’ is not the same as a ‘natural born Citizen’”
No.
“to be elected to Congress one must be a ‘citizen’ as opposed to a ‘natural born Citizen’ to be elected President.”
Yes.
“Why do you suppose the different terms were used. Were the founders merely sloppy?”
They weren’t, but apparently you are. Different terms were used to control for different conditions. NBC status is one thing, grandfathered presidential eligibility another, and congressional eligibility for naturalized citizens yet another.
No- the framers had to grandfather in those people who “created” America under article II eligibility, as nobody as of yet could possibly have two citizen parents.
Does that help clarify?