Question

Which of the following ended Russia's involvement in World War I?

the sinking of the RMS Lusitania
the First Battle of the Marne
the Treaty of Brest-Litovsk
the introduction of chemical warfare

Answer 1

Question: Which of the following ended Russia's involvement in World War I?

Answer:  Treaty of Brest-Litovsk

Explanation: Germany demanded independence for Russian so  they came up with a treaty that woul free them

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(jacemorris04)