Dear Ms. Kennedy,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Letters Received, 1789-1906 (National Archives Microfilm Publication M179) in the General Records of the Department of State (Record Group 59) that may contain the correspondence you are interested in. The records have been digitized, and they are partially indexed by the Register of and Index to Letters, Consular Despatches, and Passport Letters, 10/9/1817-12/31/1860 and by the Subject Index to Consular Despatches, Letters, and Diplomatic Correspondence, 1790-1940. Please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org for additional information about the non-digitized records.
We also located the series Despatches from U.S. Consular Officers, 1789-1906 and Despatches from Diplomatic Officers, 1789-1906 in Record Group 59 that includes National Archives Microfilm Publication M30: Despatches from U.S. Ministers to Great Britain, 1791-1906, which may be relevant to your research. Some of these records have been digitized and may be viewed via the Catalog. For access to and information about the non-digitized records, please contact RDT2.
In addition, we located the series Diplomatic Instructions, 1785-1906 in Record Group 59 that contains Volume 15: Great Britain: Apr. 16, 1840 - July 21, 1849. This volume has been digitized and may be viewed online using the Catalog. Please contact RDT2 with any questions you may have about these records.
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 RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!