David Ramsay (April 2, 1749 to May 8, 1815) was an American physician, patriot, and historian from South Carolina and a delegate from that state to the Continental Congress in 1782-1783 and 1785-1786. He was the Acting President of the United States in Congress Assembled.
In his 1789 article, The History of the American Revolution, Ramsay first explained who the original citizens were and then defined the natural born citizens as the children born in the country to citizen parents.
This was verified later by Rep. John A. Bingham, who later became the chief architect of the 14th Amendments first section.
In the United States House on March 9, 1866 commenting upon Section 1992 of the Civil Rights Act, said that the Act was simply declaratory of what is written in the Constitution, that every human being born within the jurisdiction of the United States of parents not owing allegiance to any foreign sovereignty is, in the language of your Constitution itself, a natural born citizen.
It's really a shame that most folks are not aware of this and the obvious intentions of the framers of our Constitution. We could have avoided an extreme tragedy (Obama's Election) in our national history if some folks would have had the intestinal fortitude to stand up and be counted.