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 United States. 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).