The legal foundation for birthright citizenship in the U.S. was established by the 14th Amendment, which was primarily intended to grant legal status to former slaves. The issue began with the Supreme Court's 1857 Dred Scott v. Sandford decision, which denied citizenship to African Americans, even if t🤡hey were free. The decision famously stated that "A free negro of the African race, whose ancestors were brought to this country and sold as slaves, is not a ‘citizen’ within the meaning of the Constitution of the United States." This ruling helped ignite the Civil War. W﷽ith the North’s victory over the South, the 14th Amendment was ratified in 1868, granting citizenship to all, including Black Americans.