What is the reason for Stalin’s victory?

Stalin is the leader of the USSR, who took office after V. Lenin. During his reign, the Second World War fell. In the 1930s, he carried out the process of industrialization and collectivization in the country in order to restore the economic subsystem of society. This helped to win the Second World War. Initially, a non-aggression pact was signed and the world was divided into spheres of influence. During the war, not = but the territory of the USSR, Stalin stimulated the people, raised the patriotic spirit, the industrial base.