Which major revolution, occurring in 1917, led to the overthrow of the Russian Tsarist autocracy and the establishment of the world’s first constitutionally socialist state?

💡 Explanation:

The Russian Revolution of 1917 involved two phases: the February Revolution, which overthrew the Tsarist autocracy, and the October Revolution, which brought the Bolsheviks to power and led to the establishment of the Russian Soviet Federative Socialist Republic, the world's first constitutionally socialist state.