America's entry into the World War in April 1917 presented the United States Army with its greatest challenge in the nation's history. This book examines the U.S. Army's involvement in the Great War from the declaration of war on 6 April 1917 through the initial phase of the German Spring Offensive in March-April 1918. Finally, this book is enriched with the official documents of the U.S. Government from the Fist World War. Contents: Strategic Setting The U.S. Army Before the War American Military and Civilian Leadership The Amalgamation Debate Mobilization of Manpower Building the AEF, 1917 American Soldiers Begin Arriving Training the AEF Men and Materiel in the AEF The War Department: Challenges and Reform Strategic Crisis on the Western Front The AEF Joins the Fight Official Documents of the U.S. Government from the Great War Official Positions of Principal Persons Mentioned in the Correspondence The Continuation and Further Spread of the War-Efforts Toward Peace The Continuation of the War-Participation of the United States Neutral Rights Neutral Duties Belligerent Rights and Practice Other Problems and Responsibilities