Birthright citizenship in the United States

Birthright citizenship in the United States refers to a person's acquisition of United States citizenship by virtue of the circumstances of his or her birth. It contrasts with citizenship acquired in other ways, for example by naturalization later in life. Birthright citizenship may be conferred by jus soli or jus sanguinis. Under United States law, U.S. citizenship is automatically granted to any person born within and subject to the jurisdiction of the U.S. This includes the territories of Puerto Rico, the Marianas (Guam and the Northern Mariana Islands) and the U.S. Virgin Islands, and also applies to children born elsewhere in the world to U.S. citizens (with certain exceptions).The Citizenship Clause of the Fourteenth Amendment to the United States Constitution states that ""All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.""The Pew Hispanic Center estimates that approximately 7.5% of all births in the U.S. (about 300,000 births per year) are to unauthorized immigrants. The Pew Hispanic Center also estimates that there are 4.5 million children who were born to unauthorized immigrants that received citizenship via birth in the United States; while the Migration Policy Institute estimates that there are 4.1 million children. Both estimates exclude anyone eighteen and older who might have benefited.