What were the cause of the russian revolution

The Russian Revolution of 1917 was a period of conflict, which began in 1917, which toppled the Russian monarchy and brought Vladimir Lenin's Bolshevik Party to power. Newly industrialized and suffering from World War I, Russia had a large mass of workers and peasants working hard and earning little. Moreover, Tsar Nicholas II's absolutist government displeased the people who wanted less oppressive and more democratic leadership. The sum of the factors led to popular demonstrations that caused the monarch to resign and, at the end of the process, gave rise to the Soviet Union, the world's first socialist country, which lasted until 1991.

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;

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