The Tsarist autocracy collapse in 1917 due to following reasons:

• Tsar Nicholas II was an inefficient and autocratic ruler who believed in the divine rule of the king. He used autocratic ways to handle people and crush the weaker section. A large section of the society became hostile to the Tsar which led to the end of Tsarist autocracy.
• The defeat of Russia in the First World War was very demoralising and shocking. The war led to 7 million casualties and 3 million refugees. The rest of the population became hostile to the Tsar.
• Due to the participation of the strong men in the war, there was a shortage of labour in factories which led to the shutdown of many industries.
• Large amounts of grains were sent to the army base to feed soldiers which led to the scarcity of food in cities for common people. This scarcity led to the riots at bread shops. People were dissatisfied with the policies of the Tsar.