On the morning of December 7, 1941, a large number of planes were suddenly dispatched from a Japanese joint fleet that sailed into Hawaii secretly, and together with submarines, they made a surprise attack on Pearl Harbor, the largest naval anchorage of the United States in the Pacific Ocean, sinking four American capital ships, seriously injuring one and injuring three others. More than 1 auxiliary ships such as cruisers and destroyers were sunk or injured; Hit 188 beautiful planes. The US Army and Navy Airports in Oahu were all razed to the ground, with more than 3,6 American officers and soldiers killed or injured and more than 9 missing. Except for the three aircraft carriers that were not in Pearl Harbor at that time, the US Pacific Fleet was almost completely destroyed, while Japan only lost 29 aircraft and 5 small submarines and injured 7 aircraft. This is the Pearl Harbor incident that shocked the whole world, which opened the curtain of the Pacific War.

The news of Japan's attack on Pearl Harbor quickly spread all over the world. Japan rejoiced all over the country, celebrating victory and being immersed in the fanaticism of militarism. Strangely, British Prime Minister Winston Churchill and Charles de Gaulle, the leader of the Free France Movement, all secretly rejoiced in this matter. Because they know that Japan's undeclared war is tantamount to forcing the United States to formally participate in the war. Therefore, Churchill went to bed early that night and had a good sleep. After listening to the Pearl Harbor Battle Report, Charles de Gaulle said: "Now, the war has been won with certainty!"

The Japanese bomb declared the appeasement policy pursued by the American ruling clique completely bankrupt, and the United States paid a huge price for it. However, it also "woke up" many Americans. It is said that American President Roosevelt was extremely pleased with this. On the night of Pearl Harbor, Roosevelt leafed through his beloved stamp album with great interest. Mrs. Roosevelt noticed that her husband's mood was much calmer and happier than that of the previous period. Because the contradiction between the United States and Japan has long been acute, and there is anti-war and war-weariness in the United States, and the isolationism is serious, which makes it difficult for the United States to get involved in the world anti-fascist war. Roosevelt could do nothing about it. The war in Pearl Harbor finally freed the United States from the shackles of traditional isolationism, and temporarily stopped the partisan struggle in the United States, and merged the unstoppable raging waves into a strong voice to join the war! Drop the bomb in Tokyo! On December 8, Roosevelt delivered a war address to a joint meeting of the two houses of Congress.

Roosevelt said: Yesterday, December 7, 1941, the United States of imperial japanese navy was suddenly and deliberately attacked, and we must always remember this shameful day! After Roosevelt's speech, the US Congress passed a resolution declaring a state of war with Japan. On the 9th, China's Kuomintang government officially declared war on Japan after the Sino-Japanese War had been going on for four years. On the 1th, he declared war on Germany. Then more than 2 countries including Charles de Gaulle's "Free France", Australia, New Zealand and Canada declared war on Japan.

The Pearl Harbor incident not only forced the United States to participate in the war, but also made more countries participate in the anti-fascist war, which strengthened the world anti-fascist front and promoted the final formation of the world anti-fascist alliance. Japan's occasional victory in the Pearl Harbor incident accelerated the downfall of the Japanese Empire.