3. The Russian Revolution (1917)
The Russian Revolution of 1917 was a pivotal event that led to the overthrow of the Tsarist autocracy and the establishment of the Soviet Union (bbc.co.uk). Several factors contributed to this upheaval: military defeats during World War I, widespread social inequality, and growing public discontent. These elements created a volatile environment, culminating in the abdication of Tsar Nicholas II and the rise of Bolshevik power.
