Question

To become a citizen of the United States, a person must

have been born in the United States.
have been born or naturalized in the United States.
have learned to speak English.
have cousins who are citizens of the United States.

Answer 1

have been born or naturalized in the United States.

(You become a U.S. citizen either by birth in the U.S. or by naturalization; there are also citizenship rules for children born abroad to U.S. parents.)