The act "defined" nothing. It said non natural citizens would be treated like natural citizens if they were born to US Fathers.
“The act “defined” nothing.”
Really?
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:
“the children of citizens of the United States that may be born...shall be considered as natural born citizens.”
See how that works?