On December 7, 1941, on a sunny Sunday, Japanese carrier formations launched aircraft fighters to raid Pearl Harbor, the largest naval base in the U.S. Pacific. In this battle, more than 2,000 U.S. troops were killed, several U.S. Navy warships were blown up by the Japanese Air Force, and hundreds of U.S. aircraft parked in Pearl Harbor were blown up on the spot, which is the famous Pearl Harbor incident in world history. U.S. President Franklin D. Roosevelt was shocked to hear about this, and the next day, he delivered an "angry" speech in the U.S. Congress denouncing the Japanese army. The outbreak of The First World War from 1914 to 1918 caused great injuries to the European countries, the casualties were very serious, and the huge trauma of the First World War also deeply shocked and stimulated the Americans on the other side of the Atlantic.
After World War I, the United States began to pursue an isolationist policy, they only wanted to stay outside of European affairs, and never get involved in war.

Until September 1939, when Nazi Germany took the lead in provoking a world war, the Americans did not want to get involved in the War in Europe, and many American expatriates in Europe were advised by the U.S. government to return home. A large number of American expatriates settled in Europe are on American cruise ships bound for the United States, and they just want to leave Europe, a land of right and wrong. After 1939, the Nazi Fuehrer Hitler began to expand and invade Europe unscrupulously, Europe fell into a war, all countries and European countries fell under the iron heel of the Nazis, and even the interests of the island nation of Britain in western Europe and the soviet Union in eastern Europe were seriously threatened by the Nazis.
In the face of Hitler's arbitrary actions and extreme arrogance, US President Roosevelt was deeply disturbed, and he feared that the unlimited expansion of the Nazis in the world would seriously threaten the security and interests of the United States.
Roosevelt repeatedly spoke before the U.S. Congress to bring the United States into war in order to suppress the terrible Nazi forces, but the Americans were very afraid of war, and the isolationist forces in the government still had the upper hand, interfering with Roosevelt's war ideas and policies.
In the face of these troubles, Roosevelt, as president, also felt helpless! Roosevelt was bent on bringing America into the war, and he was bide his time. As early as December 7, 1941, before the Japanese raid on Pearl Harbor, U.S. President Franklin Roosevelt learned of Japan's intentions through top-secret Japanese military intelligence intercepted by U.S. military intelligence, which came from the confession of Jenny, an American female citizen, many years later. Jenny's father, who fought in World War II and served in the intelligence service at Pearl Harbor Naval Base, knew that U.S. President Franklin Roosevelt had learned of the Japanese raid in advance.
People can't help but ask why Roosevelt didn't make preparations earlier since he knew in advance that the Japanese army was coming to raid, and let the American troops suffer extremely heavy losses afterwards.
Later, the Japanese army raided Pearl Harbor, except for the 4 American aircraft carriers patrolling outside, the US troops in Pearl Harbor were almost completely destroyed, and the Americans regarded it as the most tragic loss and disaster since the founding of the United States. In fact, regarding the intelligence of the Japanese raid on Pearl Harbor, King, who was then the supreme commander of the US Pacific Navy, also knew that he seemed to have received orders from Roosevelt to ignore it.
Why did the Japanese raid the Americans, and Roosevelt, as an American and the president of the United States, ignore them? There is only one reason to explain, combined with the situation in the United States at that time, Roosevelt did this deliberately, he deliberately allowed the Japanese to raid, and then let the U.S. naval base Pearl Harbor suffer heavy losses, so that Roosevelt could legitimately bring the United States into the war. Later, as it turned out, on December 8, 1941, the day after the Japanese raid on Pearl Harbor, Roosevelt's war policy address in Congress was unanimously approved by members of Congress.
This is a good proof of Roosevelt's previous abnormal behavior, which must have been his bitter plan against the isolationist forces in the United States and the American people.
Regarding the mystery of the Pearl Harbor incident, Dr. Ma Jun, a well-known expert in the history of war in China, mentioned in detail in his speech video.
Jenny, an American citizen, exposed Roosevelt's bitter plan to then-U.S. President Richard Nixon in the 1980s, 40 years after World War II, but U.S. President Roosevelt would be tainted by this incident. Solving the mystery of Pearl Harbor, one had to revisit Roosevelt, who has been called one of the greatest presidents in American history, to be on par with Lincoln. If the Japanese and the Japanese army knew about this matter at that time, I don't know how the Japanese felt. First of all, the intelligence technology of the Japanese army is inferior to that of the Americans. In addition, the comprehensive national strength of the United States is far above that of Japan, and the Japanese will almost never be able to defeat the Americans.
The United States can "smash" the Japanese by relying only on a steady stream of endless material resources, and the industrial strength of the United States ranked first in the world at the end of the 19th century, their industrial base is very strong, the economic strength is strong, and the Japanese can only sigh in their lifetime!