Are you going to tell us that it meant that only children of citizens born beyond the sea were to be considered natural born citizens???
It doesn't say "that are". It says "that may" which widens their definition from what it was to something more involving possibility, or chance. So then what was it before they added "that may ..."???
The Naturalization Act of 1790 clearly did not address the citizenship of those born in the United States. That was determined by common law. It only extended natural born citizenship to those born outside of the United States to citizen parents.
I don’t see how you can honestly read it any other way.