Americans Answer Call to Arms During World War I > U.S. Department of Defense > Defense Department News
![How the U.S. Military Learned to Learn in World War I: Lessons from the American Expeditionary Forces How the U.S. Military Learned to Learn in World War I: Lessons from the American Expeditionary Forces](https://warontherocks.com/wp-content/uploads/2018/08/AEF-1024x668.jpg)
How the U.S. Military Learned to Learn in World War I: Lessons from the American Expeditionary Forces
![U.S. Participation in the Great War (World War I) | Progressive Era to New Era, 1900-1929 | U.S. History Primary Source Timeline | Classroom Materials at the Library of Congress | Library of Congress U.S. Participation in the Great War (World War I) | Progressive Era to New Era, 1900-1929 | U.S. History Primary Source Timeline | Classroom Materials at the Library of Congress | Library of Congress](http://www.loc.gov/static/classroom-materials/united-states-history-primary-source-timeline/progressive-era-to-new-era-1900-1929/images/progressive-6.jpg)
U.S. Participation in the Great War (World War I) | Progressive Era to New Era, 1900-1929 | U.S. History Primary Source Timeline | Classroom Materials at the Library of Congress | Library of Congress
![World War I and America: Told By the Americans Who Lived It (LOA #289) (Library of America, 289): Berg, A. Scott: 9781598535143: Amazon.com: Books World War I and America: Told By the Americans Who Lived It (LOA #289) (Library of America, 289): Berg, A. Scott: 9781598535143: Amazon.com: Books](https://m.media-amazon.com/images/I/A1ZQ3GVm+nL._AC_UF1000,1000_QL80_.jpg)