Birthright citizenship is a longstanding common law rule, known as jus soli (right of the soil), adopted by the United States, establishing that all people born on U.S. soil and subject to U.S. law are U.S. citizens regardless who their parents might be. Not all countries follow this rule, with some following jus sanguinis (right of blood), which recognizes citizenship based on ancestry or parentage. The United States actually recognizes citizenship through both rules, with the Citizenship Clause of the Fourteenth Amendment guaranteeing a constitutional right to citizenship based on birth on U.S. soil, and Congress providing a statutory right to citizenship to the children of U.S. citizens born outside of the United States.