• United States v. Wong Kim Ark (1898) - "Ratified in 1868, the Fourteenth Amendment opens with the Citizenship Clause. It reads, “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.” The Supreme Court addressed the meaning of this key provision in United States v. Wong Kim Ark. Wong Kim Ark was born in San Francisco to parents who were both Chinese citizens. At age 21, he took a trip to China to visit his parents. When he returned to the United States, he was denied entry on the ground that he was not a U.S. citizen.In a 6-to-2 decision, the Court ruled in favor of Wong Kim Ark. Because he was born in the United States and his parents were not “employed in any diplomatic or official capacity under the Emperor of China,” the Citizenship Clause of the Fourteenth Amendment automatically made him a U.S. citizen."

Edit hit enter too soon:

From the Majority Opinion:

The foregoing considerations and authorities irresistibly lead us to these conclusions: the Fourteenth Amendment affirms the ancient and fundamental rule of citizenship by birth within the territory, in the allegiance and under the protection of the country, including all children here born of resident aliens, with the exceptions or qualifications (as old as the rule itself) of children of foreign sovereigns or their ministers, or born on foreign public ships, or of enemies within and during a hostile occupation of part of our territory, and with the single additional exception of children of members of the Indian tribes owing direct allegiance to their several tribes. The Amendment, in clear words and in manifest intent, includes the children born, within the territory of the United States, of all other persons, of whatever race or color, domiciled within the United States.

• United States v. Wong Kim Ark (1898) - "Ratified in 1868, the Fourteenth Amendment opens with the Citizenship Clause. It reads, “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.” The Supreme Court addressed the meaning of this key provision in United States v. Wong Kim Ark. Wong Kim Ark was born in San Francisco to parents who were both Chinese citizens. At age 21, he took a trip to China to visit his parents. When he returned to the United States, he was denied entry on the ground that he was not a U.S. citizen.In a 6-to-2 decision, the Court ruled in favor of Wong Kim Ark. Because he was born in the United States and his parents were not “employed in any diplomatic or official capacity under the Emperor of China,” the Citizenship Clause of the Fourteenth Amendment automatically made him a U.S. citizen."