Why did communist revolution occurred in Russia

The Russian Revolution of 1917 was a series of political events in Russia, which, after the elimination of the Russian autocracy and after the Provisional Government (Duma), resulted in the establishment of Soviet power under the control of the Bolshevik party. The result of this process was the creation of the Soviet Union, which lasted until 1991.

At the beginning of the 20th century, Russia was a country with a backward economy and dependent on agriculture, since 80% of its economy was concentrated in the countryside (production of agricultural products).

The February 1917 Revolution (March 1917, according to the Western calendar), which overthrew the autocracy of Tsar Nicholas II of Russia, the last Tsar to rule, and sought to establish a liberal republic in its place.

The October Revolution (November 1917, on the Western calendar), in which the Bolshevik Party, led by Vladimir Lenin, overthrew the provisional government and imposed the Soviet socialist government.