"[98]
Buchanan was dedicated to defending his actions prior to the Civil War, which was referred to by some as "Buchanan's War".[98] He received threatening letters daily, and stores displayed Buchanan's likeness with the eyes inked red, a noose drawn around his neck and the word "TRAITOR" written across his forehead. The Senate proposed a resolution of condemnation which ultimately failed, and newspapers accused him of colluding with the Confederacy. His former cabinet members, five of whom had been given jobs in the Lincoln administration, refused to defend Buchanan publicly.[99]
Buchanan became distraught by the vitriolic attacks levied against him, and fell sick and depressed. In October 1862, he defended himself in an exchange of letters with Winfield Scott, published in the National Intelligencer.[100] He soon began writing his fullest public defense, in the form of his memoir Mr. Buchanan's Administration on the Eve of Rebellion, which was published in 1866.[101]

Soon after the publication of the memoir, Buchanan caught a cold in May 1868, which quickly worsened due to his advanced age. He died on June 1, 1868, of respiratory failure at the age of 77 at his home at Wheatland. 