According to whose definition??? National Lampoon's???
The following shall be nationals and citizens of the United States at birth:
(e) a person born in an outlying possession of the United States of parents one of whom is a citizen of the United States who has been physically present in the United States or one of its outlying possessions for a continuous period of one year at any time prior to the birth of such person;
http://www4.law.cornell.edu/uscode/html/uscode08/usc_sec_08_00001401——000-.html