Soon after the Second World War (1939-1945), the struggle for global leadership between the two former allies that is the USA and USSR had major repercussions for the global community. The conflict of contradictory ideologies, bifurcation of the world into two rival blocs, formation of military alliances and blocs as well as proxy wars in various parts of the world represented various facets of the Cold War.
In 1945, the Allied forces (USA, USSR, Britain and France) defeated the Axis powers (Germany, Italy and Japan). The atom bombs dropped upon the cities of Hiroshima and Nagasaki in Japan led to the surrender of Japan and subsequently to the end of the Second World War. It brought about immense losses to humankind and the widespread destruction of property. The Second World War had spread regions beyond Europe and the region of Southeast Asia also got engulfed in the Second World War. The end of the Second World War saw the rise of the USA and USSR as two superpowers in world politics and importantly it also marked the beginning of the Cold War. The Cold War was not one event, but rather a series of events connected by the rivalry and polarization between the communist and capitalist systems led by the Soviet Union and the US respectively
The term cold war was widely popularized by Walter Lippmann in his book "Cold War", and it signified the relations between the two superpowers. It signaled intense competition in different arenas coupled with an ideological war between the Soviet Union and the USA. Also, the presence of nuclear weapons by both the Superpowers made the logic of deterrence more acceptable and it made sure that the two superpowers behaved in a more rational manner which aimed at avoidance of another world war and ensuring the safety of human survival.