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World War I - Wikipedia
Timeline of events in 1917 during the First World War - Historic UK
World War I: Summary, Causes & Facts | HISTORY
Why Did the US Enter World War I? - HISTORY
Timeline of World War I - Wikipedia
World War I | History, Summary, Causes, Combatants, Casualties, …
World War I Timeline: Battles & Major Events | HISTORY
Timeline of World War I (1917–1918) - Wikipedia
World War I - US Entry, Causes, Impact | Britannica
1914-1918-Online. International Encyclopedia of the First World War (WW1)