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World War I started due to several key factors:
1. **Assassination:** The killing of Archduke Franz Ferdinand of Austria-Hungary by a Serbian nationalist in 1914.
2. **Nationalism:** Intense national pride and rivalries among countries.
3. **Imperialism:** Competition for colonies and resources.
4. **Militarism:** The arms race and glorification of military power.
5. **Alliances:** Treaties that obligated countries to defend each other, like the Triple Entente and Triple Alliance.
These elements created a tense situation where the assassination triggered a chain reaction, leading to war in July 1914.