The Tomb of the American this, for a serviceman killed in WWI, was established in 1921
Since then, three more soldiers have ... four 
unknown soldiers were exhumed from four different WWI American... [DOC] [TLE] WWI Unknown - Tomb of the Unknown Soldier [PAR] United States of America (U.S.) involvement in the World War I (WWI) began 
almost two years after the heir apparent to the Austro-Hungarian throne, 
Archduke... [DOC] [TLE] Unknown Soldier Of World War I - Arlington National Cemetery [PAR] The bodies of many soldiers killed in World War I could not be identified.