Answer:
mistrust between the Soviet Union and the Western democracies
differing political systems as well as disagreements over the rebuilding of Europe and Berlin
Step-by-step explanation:
The cold war was an event of Armed-peace between two main hemispheres of the world, the Soviets and the capitalists, Lead by the USSR and the United States respectively, and it was cause primary because the differences between their political systems and theiur different desire to shape and rebuild Europe and Berlin, and the mistrust that the western democracies and the soviets had in eachother.