Title: World War I | History, Summary, Causes, Combatants, Casualties, Map, & Facts | Britannica
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World War I
Top Questions
What was the main cause of World War I?
What countries fought in World War I?
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What was the significance of World War I?
Explore the roles of Marie Curie, Mabel St. Clair Stobart, and Aileen Cole Stewart in World War I
The outbreak of war
Witness the beginning of World War I with the assassination of Archduke Franz Ferdinand on June 28, 1914

Content: The outbreak of war: Forces and resources of the combatant nations in 1914
Who won World War I? The Allies won World War I after four years of combat and the deaths of some 8.5 million soldiers as a result of battle wounds or disease. Treaty of Versailles
Read more about the Treaty of Versailles. In many ways, the peace treaty that ended World War I set the stage for World War II. How many people died during World War I? Some 8,500,000 soldiers died as a result of wounds or disease during World War I. Perhaps as many as 13,000,000 civilians also died. This immensely large number of deaths dwarfed that of any previous war, largely because of the new technologies and styles of warfare used in World War I.
Read more below: The last offensives and the Allies’ victory: Killed, wounded, and missing
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