US President Franklin Roosevelt, Soviet leader Joseph Stalin and Winston Churchill (the British Prime Minister) were all influential leaders in their time. Although they didn't always agree or cooperate with each other, they put aside their differences to save the world from the Nazi regime. The Big Three cooperated and planned with each other at the Tehran and Yalta Conferences to strategize attacks against the Japanese and Germans, form the United Nations, determine Germany's division and reparations, as well as new country borders. The Big Three met first. in the Iranian capital, Tehran, where they addressed four main issues (Naden and Blue 187-188). They needed to come up with a plan to attack the Nazis, so FDR planned D-Day with Churchill's help and Stalin helped attack the Nazis. The second question was whether the Soviets would fight Japan in the Pacific. The Allies were losing and if the Soviets had not intervened, they probably would have lost this war front (Tehran Conference 2505-2506). The next issue the Big Three discussed was how the borders of Poland, Germany and the USSR would be established after the war. FDR liked the idea of ​​advancing the Soviet border, seizing parts of Poland, and of course Stalin wanted more territory. They also approved moving the Polish border further towards Germany (Tehran Conference 2505-2506). They also discussed how they would maintain peace in the future. Because it was World War II only 21 years apart, Roosevelt wanted a new mediation group to prevent another war from happening. He called it the “United Nations” (Naden and Blue 187). The second time FDR, Churchill, and Stalin met was at the Yalta Conference to talk about four important things (Morris 1739). A...... middle of paper......Lerner, 1996. Print.Naden, Corinne J. and Rose Blue. “The United Nations.” Americans at War. Ed. John P. Resch. Flight. 3: 1901-1945. Detroit: Macmillan Reference USA, 2005. 187-188. Gale Virtual Reference Library. Internet. February 26, 2014. “Stalin, Joseph”. International Encyclopedia of Social Sciences. Ed. William A. Darity, Jr. 2nd ed. Flight. 8. Detroit: Macmillan Reference USA, 2008. 86-87. Gale Virtual Reference Library. Internet. February 26, 2014. “Tehran Conference.” Europe since 1914: Encyclopedia of the War and Reconstruction Era. Ed. John Merriman and Jay Winter. Flight. 5. Detroit: Charles Scribner's Sons, 2006. 2505-2507. Gale Virtual Reference Library. Internet. February 26, 2014. “Yalta Conference.” UXL Encyclopedia of United States History. Sonia Benson, Daniel E. Brannen, Jr. and Rebecca Valentine. Flight. 8. Detroit: UXL, 2009. 1739-1742. Gale Virtual Reference Library. Internet. February 4. 2014.