What was a cause of soviet mistrust of the western allies in world war ii?

Communism vs. Capitalism, two very different systems. Western societies were capitalistic, and the U.S.S.R. was communist. 

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.