The cause for the cold war was America feared a communist attack, and Truman’s dislike of Stalin. It is now the second half of the 20th century. The United States and the Soviet Union had once worked together as allies, but the relationship between the two countries has been becoming tense over time. The Soviet Union resented the Americans’ decades before because of the refusal to treat the USSR as a legitimate part of the international community as well as their delayed entry into World War II. This eventually led to the deaths of tens of millions of Russians. Many Americans have been in fear of Russia and their plan to control the world.