Esaias - this is very simple.
The Naturalization Act of 1790 clarified that he was a "natural-born citizen"
"And the children of citizens of the United States that may be born beyond Sea, or out of the limits of the United States, shall be considered as natural born Citizens: Provided, that the right of citizenship shall not descend to persons whose fathers have never been resident in the United States: "
Here is the link:
http://www.indiana.edu/~kdhist/H105-...ation1790.html