Final answer:
Russia adopted the political ideology being referenced in the passage due to discontentment after years of monarchist rule. The Bolsheviks, following socialist and Marxist ideologies, believed in violent revolution to overthrow the tsarist state.
Step-by-step explanation:
The primary reason why Russia adopted the political ideology being referenced in the passage is because of discontentment after years of monarchist rule. In the early 1900s, the Bolsheviks, a political faction in Russia that followed socialist and Marxist ideologies, emerged and believed that violent revolution was necessary to overthrow the tsarist state. The push for reform and its accompanying violence eventually caused Russia to withdraw from the war. The Russian Revolution of 1917, inspired by the ideas of Karl Marx, led to the establishment of a communist society in Russia.