14th Amendment to the Constitution of the United States.
Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
All persons born in the United States, except those not subject to the jurisdiction of the U.S. government (such as children of foreign diplomats) are citizens under the Fourteenth Amendment. Period. End of Story.
As far as the courts . .