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This book by Jason Phillips might answer some of your questions,,,there is a preview of the book on googlebooks.com https://www.google.com/books/edition/Looming_Civil_War/A1VuDwAAQBAJ?hl=en&gbpv=1&dq=Looming+Civil+War&printsec=frontcove…
Good Luck in your search
Dear Mr. Tucker,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 4 series in the Records of the U.S. Senate, 1789 - 2015 (Record Group 46) and 2 series in the Records of the U.S. House of Representatives (Record Group 233) that contains pre-Civil War correspondence and committee reports, which may pertain to the political division of the country. For access to these series, please contact the Center for Legislative Archives (LL) 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 LL. We apologize for this inconvenience and appreciate your understanding and patience.
We also searched the Library of Congress catalog and located 36 results for pre-Civil War correspondence that may pertain to the political division of the country. You also may wish to search for letters to the editor or opinion pieces during your selected time period in newspapers from the Library of Congress.
We hope this is helpful. Best of luck with your research!