Final answer:
An effect of the Russian Revolution was that Russia dropped out of WWI.
Step-by-step explanation:
An effect of the Russian Revolution was that Russia dropped out of WWI. The war effort was diverting vital resources from the people of Russia and causing suffering. The Bolsheviks, a socialist party, emerged as the leading political faction in Russia and eventually seized power, signing an armistice with Germany prior to the end of the war.