Introduction

Second world war is a combined form of two seperate millitary conflict, one is in asia which is sino Japanese war and another is European war Between Germany and Soviet Russia in terms of Poland invasion.
Basically, with the starting of Sino Japanese war in 1937, the roots of second world war started then 1939, with conflict between Germany and Russia. This two seperate conflict combined and turned into global millitary conflict. That is second world war. In this war world superpower seperate into two portion, one is allies and another is axis