Final answer:
The provision that states that all persons born in the United States are citizens can be found in the 14th Amendment.
Step-by-step explanation:
The provision that states that all persons born in the United States are citizens can be found in the 14th Amendment to the United States Constitution. The citizenship clause in Section 1 of the 14th Amendment declares that all persons born or naturalized in the United States, and subject to its jurisdiction, are citizens of the United States and of the state where they reside.