After World War II, the United States and the Soviet Union became enemies and entered into a Cold War. The two countries were allies in the fight against Nazi Germany, but tensions grew as both countries emerged from the war as world powers. The allies had joined together out of need, not desire. As the Soviet Union sought to spread communism, capitalist America adopted a policy of containment. Their growing suspicion of each other led to the Cold War, an indirect conflict born from fear of nuclear destruction and led by each country supporting different international conflicts through aid and acquisition. As allies during World War II, the United States and the Soviet Union joined forces against Nazi power. In a joint message of aid to the Soviet Union in 1941, Roosevelt and Churchill wrote to the ally about the urgency of defenses against Nazi attacks and their intention to send supplies (Document A). While the countries had a common interest in defeating Nazism, tensions existed in the form of disagreements during the war. The following year, Stalin, in a memorandum addressed to his collaborators, wrote about the opening of a second front in Europe. After Churchill declared the organization of another front impossible and the United States supported him, Stalin expressed his intention to do so and declared that Churchill's position was a "moral blow" to the Soviet Union (Document B). After the war, the United States and the Soviet Union turned into enemies as common ground disappeared and the United States criticized the Soviet Union's policies. In Our Russian Ally (1945), Vera Micheles Dean discusses the differences between the two countries with opposing governmental ideals. It states that resolving the differences would require Russia to participate in international agencies to explain its intentions (...... middle of paper ......rs! " (Document H). The Soviet Union and its communist nations of Eastern Europe created a rival alliance called the Warsaw Pact This created a political division of Europe that worsened the Cold War. introduced the Marshall Plan to help countries with whom they had positive relations and assist them in rebuilding infrastructure. In conclusion, conflict after World War II arose between the United States and Russia due to the. growing distrust between the two opposing nations. The Cold War was fought between the United States and the Soviet Union as they both attempted to expand their government policies towards other countries. and changes in control over post-war Europe, the two nations acted against each other to preserve their countries' interests and sought to fight each other in a post-war power race..