Jus soli (English: /dʒʌs ˈsoʊlaɪ/; Latin pronunciation: [juːs ˈsɔ.liː]), meaning "right of the soil", commonly referred to as birthright citizenship, is the right of anyone born in the territory of a state to nationality or citizenship.
Jus soli was part of the English common law, in contrast to jus sanguinis, which derives from the Roman law that influenced the civil-law systems of continental Europe. As an unconditional basis for citizenship, jus soli is the predominant rule in the Americas, but it is rare elsewhere. Since the Twenty-seventh Amendment of the Constitution of Ireland was enacted in 2004, no European country grants citizenship based on unconditional jus soli.
Almost all states in Europe, Asia, Africa and Oceania grant citizenship at birth based upon the principle of jus sanguinis (right of blood), in which citizenship is inherited through parents not by birthplace, or a restricted version of jus soli in which citizenship by birthplace is automatic only for the children of certain immigrants. Countries that have acceded to the 1961 Convention on the Reduction of Statelessness will grant nationality to otherwise stateless persons who were born on their territory, or on a ship or plane flagged by that country.