250 WWII Japan's surprise attack on Pearl Harbor on December 7, 1941, quickly led to full American involvement in World War II. One day later the U.S. declared war on Japan. Germany and Italy, Japan's Axis allies, then declared war on America. The U.S. reciprocated by declaring war on the Axis. The U.S. then joined in a full military partnership with Great Britain, the Soviet Union, and other members of the Allies. Although Japan pulled America into the war, the U.S. decided to send most of its military force against Hitler's Germany. Germany was considered far more dangerous than Japan. Germany had to be stopped before it could defeat the Soviet Union. Germany also had to be defeated before its scientists could complete development of an atomic bomb. In November 1942, America sent its troops against the German forces in North Africa. After the Allied victory in Africa, U.S. forces attacked German forces in Italy. Then on D-Day (June 6, 1944), the Allies mounted a huge amphibious attack on Hitler's forces along the northern coast of France. Despite heavy casualties, the Allies established a beachhead and then battled their way inland. Allied troops liberated France and other western European nations from Nazi control while pushing eastward toward Germany. Meanwhile, the Red Army of the Soviet Union, at a cost of millions of lives, stopped the Nazi advance into Soviet territory. In 1943, the Soviets started to push the Nazis back towards Germany. By early 1945, Allied armies were marching into Germany. On May 7, 1945, Germany surrendered. During these final days, Hitler committed suicide. As the Allies closed in on Germany, they revealed the horrible fact that Hitler had carried his racist beliefs to their "logical" conclusion. At places such as the death camp at Auschwitz, the Nazis systematically carried out Hitler's "final solution" to the "Jewish problem." By the time the Allies had arrived to stop the genocide, the Nazis had murdered over six million Jews. The Nazis also engaged in the mass murder of Gypsies, and mistreated prisoners of war, especially Russians. Meanwhile, the U.S. also fought a war on the other side of the world against Japan. Brilliant tactical moves by the U.S. navy led to a major Japanese defeat in the Battle of Midway in 1942. The U.S. then pursued an island-hopping campaign across the Pacific. U.S. forces seized strategically important islands in the Pacific and then "leapfrogged" over less important islands to the next strategic locations. Using this strategy, American forces moved closer to Japan without needless loss of men and materiel. Finally, by 1945, the U.S. forces had "hopped" to islands so close to Japan that direct bombing raids on Japan were launched. Two such raids occurred in August 1945 when American B-29 bombers dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. Japan soon surrendered, and World War II ended. A new era, however, the nuclear age, was just beginning. The Axis' defeat was impossible without the participation of America's civilian population. Men and women worked overtime to produce huge quantities of war materials. To conserve on resources needed for the war, the country rationed gasoline, rubber, and other commodities. Few people complained. Support for the war was high. There was, however, at least one unfortunate wartime development within the U.S. American citizens of Japanese ancestry were considered potentially disloyal and thus sent to internment camps. This action, as well as seizing Japanese-American's property, was in direct violation of their rights as U.S. citizens. Long before the end of the war, the Allies began working on plans for postwar peace. In 1941 F.D.R. and Churchill drew up the Atlantic Charter which stated the Allies' war aims. Among them was restoring self-government to all conquered nations and establishing a new world organization to replace the League of Nations. In February 1945, Churchill, Stalin, and an ailing Roosevelt -- he died two months later -- met at Yalta (in the U.S.S.R). At the Yalta Conference, the leaders agreed that nations liberated from the Axis would be allowed to establish independent, democratically elected governments. They also agreed that Germany and its capital, Berlin, would be divided into four zones and occupied by the Allies. Also, a special military court would be created to try Axis leaders charged with war crimes such as the mass murder of Jews. Finally, the Allied leaders agreed to begin writing a charter (constitution) for a new world organization to be called the United Nations. When the war ended, the Allies fulfilled several peace agreements. They established a new world organization, the United Nations, and this time the U.S. Senate voted in favor of U.S. membership. They set up a special war-crimes court in Nuremberg, where the judges found nineteen Nazi leaders guilty and ordered them punished. The Allies established additional courts to try lower-ranking Nazis. They divided Germany and its capital into four zones and occupied it. Unfortunately, not all nations liberated from the Nazis were set free. The Soviet Union imposed communist rule on East European nations that it "freed" from the Nazis. Anger over this Soviet violation of the Yalta Agreement caused a new conflict called the "cold war."