Now, perhaps, only those enmeshed in 19th-century American history know his name; but when John Hay died in 1905, he was one of the most famous men in the world. And one of the most highly regarded. Abraham Lincoln's private secretary during the Civil War, thereafter as a popular poet, novelist, newspaper editor, highly esteemed historian and biographer, diplomat, businessman, and secretary of state until his death, Hay enjoyed remarkable success...