The centenary of America's declaration of war in 1917 is a fitting time to examine afresh the reaction of the American churches to the conflict. What was the impact of the war on the churches as well as the churches' hoped-for influence on the nation's war effort? Commenting on themes such as nationalism, nativism, nation-building, dissent, just war, and pacifism, this book provides a window into those perilous times from the viewpoint of Mainline and Evangelical Protestants, Roman Catholics, Lutherans, Pentecostals, Mennonites, Quakers, Mormons, and Jehovah's Witnesses. Also included are chapters on developments among American military chaplains in the First World War and the reaction of the American churches to the Armenian Genocide.