Question

why Russian civil war took place

Answer 1

due to quarraling among the countries

Answer 2

The Russian Civil War (1918-21) was fought to decide who should control Russia in the wake of the October 1917 revolution. During this period a conglomerate of anti-Bolshevik groups, dubbed the Whites, fought to remove the Bolsheviks from power and restore some elements of the old order. The Russian Civil War emerged from strong and widespread resistance to the new Bolshevik order. Opposition to the Bolsheviks after the October 1917 was pronounced, however in early 1918 this opposition began to strengthen and intensify into a counter-revolutionary movement.