natural born citizens are 14th amendment persons.the nationally act of 1940 and 1952 cleared up what the united states is, it includes puerto rico, u s virgin islands guam northern mariana islands. if you are born anyplace else you have two citizenships.the place whare born and that of your parents.when you reach 18 you must deside what you want.in the case of panama canal zone john mccain had to depend on his parents to be decleared a us citizen. he is not a citien at birth .see us code tittle 8 ch 12 sec 1402.to get a certificate of citienzship ,you must take oath to the united states.natural born citizen do not have to do that.