Bing found the following results
World War I - Wikipedia
World War I | History, Summary, Causes, Combatants ... - Britannica
Causes of World War I - Wikipedia
United States in World War I - Wikipedia
World War I - Simple English Wikipedia, the free encyclopedia
Outline of World War I - Wikipedia
Timeline of World War I - Wikipedia
World War I | Britannica
Allies of World War I - Wikipedia
World War I - Wikiwand