Currently on my nightstand. The Demon of Unrest by Eric Lawson.
I'm still in the early portion of the book (just after the 1860 Presidential Election) but this is as good as Devil in the White City and In the Garden of Beasts. The time between the election and the shelling of Fort Sumpter.
From the forward. "I was well into my research on the saga of Fort Sumter and the advent of the American Civil War when the events of January 6, 2021 took place. As I watched the Capitol assault unfold on camera, I had the Erie feeling that present and past had merged. It is unsettling that in 1861 two of the greatest moments of national dread centered on the certification of the Electoral College vote and the presidential inauguration"