in American Samoa, a group of islands 2,500 miles southwest of Hawaii. Samoans can only claim citizenship if they have a parent who was a citizen; otherwise, they have to go through the same naturalization process of non-Americans.

http://www.slate.com/blogs/the_slatest/2015/06/05/american_samoa_the_only_place_in_the_u_s_where_citizenship_isn_t_granted.html

Tulsi’s Mother and Father were US citizens at the time.

She is eligible to be President.