US policies toward the Soviet Union and the crisis in Azerbaijan during the Qavam period (1945-1947)

World War II led Iran to engage in global events unwittingly and occupied by the three powers; but with the end of the war and the non-evacuation of the Soviet forces from Iran, the Cold War first sparkles were struck between the two ideological poles, the Soviet Union and the United States. While the USSR sought to obtain Iranian north petroleum, by pressure, stood in front of the United States with the policy of preserving Iran on the front of the Western countries, against the Soviet Union. Though in many researches United States ultimatum has been referred, as the main source, to the Soviet Union for evacuation of Iran, but the study shows that such ultimatum has no historical validity; Therefore, the question is that the US with using what tools and tactics, were able to carry out its goal of expelling the Soviet Union from Iran and maintain Iran on the liberalism front. To answer this question, using a historical method based on description and analysis, tried to answer by examining US State Department documents. The findings show that US by using two types of international instruments, such as the Security Council and the alliance with the UK, and domestic instruments such as cooperation with the Shah and the National Parliament, tried to restrict USSR in Containment policy.