As a work of presidential prose, James Buchanan’s inaugural address on March 4, 1857, is widely considered one of the most forgettable ever given by an American leader. As The New York Times put it dryly at the time: “Little if any impression has been made by the inaugural.” Still, it would not take long for Buchanan’s unimpressive inauguration to become one of the most significant in history. For one thing, it was the first to be photographed. It was also the first inaugural given after the creation of the Republican Party, the last before secession and ultimately the last...