WWII, the second World War, was a global war where all the great powers chose between two alliances—the allies or the axis. This war lasted a total of six years from 1939 to 1945.
The USSR, Union of Soviet Socialist Republics, was a socialist alliance that existed from 1922 to 1991. The union was a group of Soviet Republics where the economy and government were highly centralized. The country was governed by a one-party state, the Communist Party, with Moscow as its Capital. Their motto was “Workers of the world, unite.”
Before I get started, I want to make sure everyone understands the definition of each system. The dictionary definition of socialism is a political and economic theory of social organization which advocates that the means of production, distribution, and exchange should be owned or regulated by the community as a whole. Capitalism is an economic and political system in which a country's trade and industry are controlled by private owners for profit, rather than by the state. In other words it means “free-market.” Socialism being closer to a system of government called “communism.”