[doldrumsforgop]

Ok, take your pick for the definition

https://en.wikipedia.org/wiki/Birthright_citizenship_in_the_United_States

http://definitions.uslegal.com/b/birthright-citizenship/

[kabar]

Birthright citizenship is based on jus solis. You don't have to apply for birthright citizenship like you do with jus sanguinis derivative citizenship. There are conditions for transmitting US citizenship via the parent(s).

Acquisition of U.S. Citizenship by a Child Born Abroad