Bolshevism had nothing to do with the start of World War 1. The war was a confrontation between European great powers and wasn't a conflict of ideologies. WW 1 was brought about by errors and nationalism. Ironically, Bolshevism caused Russia to leave WW 1. So its ideology became connected to the war.
Russia pulled out of world war 1 because of this reason: NOT SURE! Actually, Russia pulled out because of an internal revolution. It was right after Czar Nicholas II was overthrown. ... ... the Bolshevik Revolution prompted Russia to pull out of the war...so basically there was a civil war within Russia, so they had to concentrate on that rather than the world war Farz xx