What was the greatest cause of tension between the United States and the Soviet Union after World War II? different forms of government and economy different views about the use of atomic weapons accusations the United States delayed the D-Day invasion accusations the Soviets did not enter the war against Japan quickly enough

I believe that most of the tension was focused on the threat of nuclear war. One of the main focuses of the Cold War was to amass more nuclear weapons than the other side. This created more pressure than both sides could handle, and it created tons of scenarios where, if not treated differently, could have caused global thermo-nuclear war that could destroy Earth. Both sides wanted to prevent that from happening.