The original Constitution provides no definition for Natural Born, which implies that anyone who isn’t naturalized at some later point is natural born. In 1790, in full view of the Founding Fathers, they defined natural born. Keep in mind, they only DEFINED what was already understood to be natural born, the law was designed to create that definition. You have no other evidence that the Founding Fathers mean something else, do you?
You must be referring to the naturalization act of 1790, which, by the way, only said that children born overseas to American citizens would be treated "as if" they were natural born, not necessarily that they were natural born. This language was removed in an amendment to that act, and was never again seen.
Yes, we do. James Madison took that definition out of the law. Look at the members of the 4th Congress..Remember John Adams? He was President of the Senate and Vice President at the time. Later to become President. George Washington was President.