What was the main reason for the outbreak of World War I, which began in 1914?

Category: History · Difficulty: hard

Hint: This incident triggered a series of alliances and tensions.

Answer

Assassination of Archduke Franz Ferdinand

Explanation

The assassination of Archduke Franz Ferdinand in 1914 set off a chain reaction of alliances that led to the war.

This is a hard history riddle — a tricky one that takes a little thought. The answer is Assassination of Archduke Franz Ferdinand.

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