"When Abraham Lincoln delivered the Gettysburg Address in 1863, he had broader aims than simply rallying a war-weary nation. Lincoln realized that the Civil War had taken on a wider significance-that all of Europe and Latin America was watching to see whether the United States, a beleaguered model of democracy, would indeed 'perish from the earth.' In The Cause of All Nations, distinguished historian Don H. Doyle explains that the Civil War was viewed...