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What caused Russia to exit World War I in 1917?

A. the death of the czar
B. a revolution within Russia
C. a surprise invasion by Poland
D. the bankruptcy of the Russian treasury

1 Answer

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It was "B. a revolution within Russia" that caused Russia to exit World War I in 1917, since the communists removed the Czar from power. It should be noted that this eventually led to the Czar's execution. 
User David Hersey
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