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Hello Ms. Moore,
At the National Archives we have records of citizenship renunciation but only until 1946. They are in Record Group 85, Records of the Immigration and Naturalization Service. A guide for these records is here.
Records after 1946 are still in the custody of the U.S. State Department. The only route you can take is to submit a Freedom of Information Act (FOIA) request for citizenship case files. The State Department has this guide to help you compose such a request.
Thank you for submitting your question to the History Hub! Best of luck in your endeavor.