I don't know if someone who was a foreign citizen first, then becomes an American citizen has to renounce.
I do know if you are a born-in-the-U.S.A. citizen and you qualify for another country's citizenship and become one, you can be a citizen of both countries. I know this firsthand due to my recently acquired Irish citizenship status (and passport).
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Chino 1960's to 1976, Torrance, CA 1976-1983, 87-91, 94-98 / Frederick Co., MD 1983-1987/ Valencia, CA 1991-1994/ Brea, CA 1998-2002/ Dana Point, CA 2002-2019/ Knoxville, TN 2019-Current/ FL 2022-Current
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