The Cold War began after World War II, leaving the United States and the Soviet Union two of the strongest allies fighting against the Axis. Although they had strong allied relations, the two countries did not always agree on the same ideas. For example, the United States disagreed that the Soviet Union was a communist country under the rule of Joseph Stalin even though they believed in capitalism. The United States did not have power over Soviet power and was one of the most militarily powerful countries at the time. The Soviet Union had grudges against the United States, such as not entering the war soon enough, causing many Russian soldiers to die, which also added tension to their alliance. Its tensions in its alliance were later the cause of the Cold War. First, the United States feared that the Russians would try to take control and influence the popularity of communism in other countries. Then this fear became reality as the Soviet Union sought to increase the control of communism and expand it across the world. The United States had developed the atomic bomb and dropped it on Hiroshima and Nagasaki, and the Soviet Union wanted information. If the Soviet Union had had access to it, it could have used the atomic bomb to enforce the spread of communism. Furthermore, the Soviet Union expanded after the war to countries that would soon be ushered into communism and the United States did not want communism to spread a bigger father than it already had. The Soviet Union wanted to expand its borders in order to gain more protection. Both countries had completely opposite ideas on how to rule and manage a country, which in turn created chaos and was the main cause of the Cold War. The need for power was... middle of paper ... their actions. The Soviet Union attempted to spread communism across the world and the United States intervened and created the Truman Doctrine in which they stated that they would prevent the spread of communism. The United States was trying to protect other countries from communist control. After World War II, the United States designed the Marshall Plan to provide economic aid to Europe and Russia. However, the Soviet Union declined their offer and did not accept the aid offered by the United States, increasing tensions between the two. Later stating that the United States had not offered enough aid to the Soviet Union, when in fact it had. America is also guilty of trying to interfere with the way Stalin ruled Russia. It was his choice to conform to communism rather than his people, just like the United States decided to capitalism..