A descendant of Scottish settlers, Archibald McKinley was born in Lexington, Georgia, in 1842 and served as a Confederate officer during the Civil War. Just after the war, he began farming near Milledgeville, Georgia, and within a year had met and married Sarah Spalding, a granddaughter of Thomas Spalding, who had built his plantation empire on Sapelo Island. In 1869, the McKinleys moved to Sapelo to raise cotton, sugar cane, and other crops. The bulk of this journal is a sustained account of their sojourn on the island through 1876, before their return to Milledgeville.

The brief, matter-of-fact entries that make up McKinley's journal focus mainly on the small occurrences that filled his days: farm work, hunting and fishing expeditions, sailing excursions, church services, changes in the weather, the disposition of his crops, the development of the Darien timber shipping trade. Scattered throughout, however, are intriguing references to dramatic events--shootings, trials, tensions between whites and the recently freed blacks--and to the processes of Reconstruction, as when McKinley notes that "a company of Yankee soldiers" had arrived at the penitentiary to ensure equal treatment of black and white convicts. The longest entry in the journal is a eulogy for a freedman named Scott, who, as McKinley's slave, had remained "true as steel" during McKinley's service in the Civil War.