Franklin D. Roosevelt’s leadership decisions in World War II have negatively impacted the post-war Cold War because of FDR being taken advantage of by Joseph Stalin during three major conferences to discuss things together. These decisions can be seen through the 3 major conferences during World War II and after. The Tehran Conference, the Yalta Conference, and the Potsdam Conference.The Tehran Conference was held in Iran from November 28th – December 1st. (1943) At this conference, the big three which consists of Stalin, FDR, and Churchill, were scheduled to meet with each other. They were looking to change the postwar fate of the world. They were making decisions for the post World War II era.They first discussed the allies’ advancements during the war such as the invasion of northern France. Also, known as D-day. And, the invasion of Southern France and the need to capture Finland out of Hitler’s command. This conference eventually paved the way to stronger allied relationships. The Second Conference was the Yalta Conference. This took place from February 4th to the 11th around the Black Sea. This Conference was called by Stalin, the soviet Leader. The goal of the Conference was to shape a post-war peace. And, in addition, to discuss a re-establishment of the Nations. During this conference, they discussed and agreed upon which countries would have independent governments with free elections. However, only if the Governments are Soviet friendly. Other major issues they discussed were defeating Japan. As well as, discuss a re-establishment of the United Nations. At Yalta, Roosevelt and Churchill discussed with Stalin the conditions under which the Soviet Union would enter the war against Japan and all three agreed that in exchange for Soviet participation in the Pacific theater, the Soviets would be granted a sphere of influence in Manchuria following Japan’s surrender. This included the southern portion of Sakhalin, a lease at Port Arthur, a share in the operation of the Manchurian railroads, and the Kuril Islands. This agreement was the major accomplishment of the Yalta Conference. Stalin agreed on declaring war against Japan after the 90 days in which Germany would have to surrender. This conference was a critical turning point in the Cold WarThe Soviet Union agrees to join the United Nations. Stalin agreed that Poland would become a free state, with their own government, but he later goes against this agreement and installs a communist government in Poland. FDR is weak because he was gullible enough to believe Stalin would honor the agreement. This was one of the many bad decision on his part to trust Stalin. The Last Conference was the Potsdam Conference. It was held from July 17 to August 2, 1945. The big three met but it was Truman not FDR due to his death. They continued talking about the post-war borders previously talked about at the previous conference, Yalta. They agreed to split Korea into North and South which becomes a Proxy war after the Cold War. Furthermore, Germany did surrender. However, Japan kept on fighting. All three came up to a decision and agreed to give Japan an ultimatum. It was to either surrender or get destroyed. To add on, they discussed necessary arrangements for post-war Europe as well as they agreed to divide and split up Berlin into 4 sections.The three outcomes regarding the actions discussed and acted upon from those three conferences were nonetheless very big.In the Tehran Conference, allied friendships were growing. Also, of course, the coordinated military strategy against Germany and Japan.In Yalta, War in Europe is declared because Germany attacked Polish Independence. The U.S. scheduled a new meeting regarding Soviets entering united Nations. Stalin agreed to work with the United Nations which Roosevelt was thrilled about To, actually form a United Nations with the big four. The U.S., The British, USSR, and China. To add on, At Yalta, Stalin, FDR, and Churchill agreed that to Soviet Union would be in control of the Iron Curtain. The Iron Curtain was the name for the boundary dividing Europe into two separate areas from the end of World War II in 1945 until the end of the Cold War in 1991. Furthermore, In Potsdam, an outcome of Japan not surrendering was them receiving an ultimatum by the Allies. Basically, surrender or get destroyed.Of the several countries affected by FDR’s decisions during WWII, Korea, Germany and Poland were impacted the most. The USSR declares war on Japan. Likewise, the United States then proposes to the Soviets the 38th parallel as the line of demarcation for accepting the surrender of Japanese troops in Korea. The USSR agrees and Japan surrenders. At the Moscow Conference of Foreign Ministers, the United States, Britain, and the USSR agree to place Korea under a four-power United Nations trusteeship for up to about 5 years. And with Germany, all their aspects of industry that could be used for military purposes were to be dismantled. All German military and paramilitary forces were to be eliminated and the production of all and any military hardware in Germany was forbidden. The reconstruction of a national German Government was postponed and the Allied Control Commission which was made up of the United States, France, Britain, and the Soviet Union) would look after the country and run it during interregnum. They also remade along democratic lines by repeal of all discriminating laws against the Jews and others from the Nazi period and named Nazi’s war criminals. Lastly, with Poland, the Russians were to gain territory from the eastern portion of Poland. And, Poland was to compensate for that by extending its Western borders, thereby forcing out millions of Germans. And, as Stalin has said at Yalta, he promised free elections, notwithstanding the recently installed communist government.