Referring to the war that was raging across parts of the American landscape, Abraham Lincoln told Congress in 1862, "We shall nobly save, or meanly lose, the last best hope on earth." Lincoln recognized what was at stake in the American Civil War: not only freedom for 3.5 million slaves but also survival of self-government in the last place on earth where it could have the opportunity of developing freely. Noted historian Steven E. Woodworth tells...