The 1917 Russian Revolution was not, as many people suppose, one well organised event in which Tsar Nicholas II was overthrown and Lenin and the Bolsheviks took power. It was a series of events that took place during 1917, which entailed two separate revolutions in February and October (with a great deal of political wranglings inbetween), and which eventually plunged the country into Civil War before leading to the founding of the Communist State.
The Caste system was based on the religion of Hinduism, whilst in the Feudal system the Roman Catholic Church and in it's beliefs were followed. The highest class for the Feudal system was the King; but in the Caste system it was the Brahmins (Priests), although the king was part of the second tier the Kshatriyas. The Feudal system existed during the middle ages and when it ended it caused the end of the middle ages. The Caste is still being followed today in India.
To avoid another German attack on the Russians, to create a buffer zone between the soviet union and the west, and to supply materials in order to rebuild the soviet economy
