Birthright citizenship in the United States

United States citizenship can be acquired by birthright in two situations: by virtue of the person's birth within United States territory while under the jurisdiction thereof (jus soli), or because at least one of their parents was a U.S. citizen at the time of the person's birth (jus sanguinis). Birthright citizenship contrasts with citizenship acquired in other ways, for example by naturalization.

Source: Wikipedia — Birthright citizenship in the United States (CC BY-SA 4.0)