When the Nazi Germany attacked the Soviets at the beginning of World War II, the USA, the UK and the Soviet Union took part on the same side and were called the Allies. In order to convey the military aid to the Soviets through Iran, the USA and the UK invaded Iran with the Soviets and dethroned Ahmad Reza Shah, who felt sympathy for Germany. By signing a treaty in 1942, they pledged to evacuate their troops from Iran six months after the war ended. They published a declaration that they would protect Iran’s territorial integrity as well as they repeated these decisions during the conference they made in Tehran in 1943. However; despite these decisions, a hidden rivalry began between the USSR and the West in Iran. The rivalry became very clear towards the end of the war. The Soviets wouldn’t withdraw from Iran. Additionally, they endeavored to divide Iran. The Iran crisis of 1946 between the West and the Soviets formed the start of the Cold War according to some people. As a country, Iran was highly affected by this process.