The Potsdam Conference at the end of WWII initiated the Cold War. At this conference, President Truman mentioned to Stalin that they had an atomic bomb, which is where the threats related to the Cold War began. The Potsdam Conference also involved a lot of discussion about the future of Germany. Stalin and the Soviets were upset with Germany and wanted to order reperation payments to weaken Germany, whereas Truman and the Americans wanted a strong, united Germany. This contributed to the tension between these two countries that began the Cold War.