Dear Mr. Ciuevich,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 2 series in the Records of District Courts of the United States (Record Group 21) that pertain to South Carolina Naturalizations in the 1860s. For access to these non-digitized records, please contact the National Archives at Atlanta (RE-AT) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RE-AT. We apologize for this inconvenience and appreciate your understanding and patience.
These South Carolina naturalization records (see above) have been digitized and are name-searchable online using Ancestry. There may be a fee for using Ancestry. Instead, you may wish to contact your local library. Many library systems subscribe to these sites, making them free for patrons.
We hope this is helpful. Best of luck with your family research!