[Editor's Note: This is part 5 of a multi-part series.] On April 6 — a hundred years ago —  the United States declared war on Germany. The history of America's entry into the Great War is complex and profound. It has intrinsic drama, no matter what one's attitude about the rights and wrongs of U.S. participation in the war--and there have been many. Wartime Allied propaganda had Americans believing the Germans were solely guilty, and that the conflict was a war for democracy, when the most autocratic country in Europe, Russia, was on the Allied said. American entry, of course, was a...