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The first involvement of the United States in the wartime conferences between the Allied nations opposing the Axis powers actually occurred before the nation formally entered World War II. In August 1941, President Franklin Roosevelt and British Prime Minister Winston Churchill met secretly and devised an eight-point statement of war aims known as the Atlantic Charter, which included a pledge that the Allies would not accept territorial changes resulting from the war in Europe. Following the Japanese attack on Pearl Harbor, the wartime conferences focused on establishing a second front.

===The Casablanca Conference, 1943===

The Casablanca Conference was a meeting between U.S. President Franklin D. Roosevelt and British Prime Minister Winston Churchill in the city of Casablanca, Morocco that took place from January 14–24, 1943. While Soviet Premier Joseph Stalin received an invitation, he was unable to attend because the Red Army was engaged in a major offensive against the German Army at the time. The most notable developments at the Conference were the finalization of Allied strategic plans against the Axis powers in 1943, and the promulgation of the policy of “unconditional surrender.”

The Casablanca Conference took place just two months after the Anglo-American landings in French North Africa in November 1942. At this meeting, Roosevelt and Churchill focused on coordinating Allied military strategy against the Axis powers over the course of the coming year. They resolved to concentrate their efforts against Germany in the hopes of drawing German forces away from the Eastern Front and to increase shipments of supplies to the Soviet Union. While they would begin concentrating forces in England in preparation for an eventual landing in northern France, they decided that first, they would concentrate their efforts in the Mediterranean by launching an invasion of Sicily and the Italian mainland designed to knock Italy out of the war. They also agreed to strengthen their strategic bombing campaign against Germany. Finally, the leaders agreed on a military effort to eject Japan from Papua New Guinea and to open up new supply lines to China through Japanese-occupied Burma.

====Requirement that AXIS powers unconditionally surrender====

On the final day of the Conference, President Roosevelt announced that he and Churchill had decided that the only way to ensure postwar peace was to adopt a policy of unconditional surrender. The President clearly stated, however, that the policy of unconditional surrender did not entail the destruction of the populations of the Axis powers but rather, “the destruction of the philosophies in those countries which are based on conquest and the subjugation of other people.”

===The Tehran Conference, 1943===

====The US and Britain agree to launch an invasion of France and USSR would start major Offensive on Eastern Front====

Broader international cooperation also became a central theme of the negotiations at Tehran. Roosevelt and Stalin privately discussed the composition of the United Nations. During the Moscow Conference of the Foreign Ministers in October and November of 1943, the United States, Britain, China, and the Soviet Union had signed a four-power declaration whose fourth point called for the creation of a “general international organization” designed to promote “international peace and security.” At Tehran, Roosevelt outlined for Stalin his vision of the proposed organization in which the future United Nations would be dominated by “four policemen” (the United States, Britain, China, and Soviet Union) who “would have the power to deal immediately with any threat to the peace and any sudden emergency which requires action.”

====The Three Powers agree to ensure Iran's territorial integrity after the War====

Finally, the three leaders issued a “Declaration of the Three Powers Regarding Iran.” Within it, they thanked the Iranian Government for its assistance in the war against Germany and promised to provide it with economic assistance both during and after the war. Most importantly, the U.S., British, and Soviet Governments stated that they all shared a “desire for the maintenance of the independence, sovereignty, and territorial integrity of Iran.”

===The Yalta Conference, 1945===

The Yalta Conference took place in a Russian resort town in the Crimea from February 4–11, 1945, during World War Two. At Yalta, U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin made important decisions regarding the future progress of the war and the postwar world.

By the end of April, the new administration clashed with the Soviets over their influence in Eastern Europe, and over the United Nations. Alarmed at the perceived lack of cooperation on the part of the Soviets, many Americans began to criticize Roosevelt’s handling of the Yalta negotiations. To this day, many of Roosevelt’s most vehement detractors accuse him of “handing over” Eastern Europe and Northeast Asia to the Soviet Union at Yalta despite the fact that the Soviets did make any substantial concessions.