Yalta took place in Crimea, Soviet union whereas Potsdam took place in Potsdam, Germany. Yalta and Potsdam included The Big Three, President Roosevelt, Prime Minister Winston Churchill, and Premier Joseph Stalin. Although at that time Potsdam had President Truman and Clement Attlee. Yalta was to discuss peace plans after WWII. Potsdam was meant to settle issues left from the Versailles Treaty but failed and ultimately led to the Cold War.