Events in 1917 had a dramatic influence on the course of World War I. This exciting book about the second half of World War I details the effects of the political revolution in Russia and the entry of the United States into the war. Exciting stories of tank warfare, war at sea, and war in the air--highlighting famous flying aces--are featured along with such famous battles as Vimy, Passchendaele, and the Hundred Day Offensive. Find out how fresh U.S. forces helped bring the war to a conclusion and an armistice, or agreement to stop fighting, with Germany.