The only requirement is that a person is a natural born citizen. This means if you receive citizenship automatically by being born, you are a natural citizen. If you have to acquire it because you do not posses it, then you have to become naturalized.
My son was born on foreign soil, to a foreign woman, and issued a foreign birth certificate from the hospital. His father (me)is an American. He is american, because my american sperm produced him. He did not need to ask to become a citizen. He was born one. He is a natural U.S. citizen. Also, as much as I hate Obama, It wouldn't matter if he was born in Kenya, his mother is American, and that makes him American.
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