World War II was the largest battle in human history to date, involving more than 2 billion people. The evil deeds of Nazi Germany, the initiator of the war, were even more deplored, and Hitler ordered the construction of concentration camps, and a series of cruel methods caused the loss of 6 million Jews' lives. As another initiator of World War II, Japan launched wars of aggression everywhere and plundered resources.
Japan is also extremely confident, after being restricted by the United States to export oil, it decided to sneak attack pearl harbor in the United States, although it was successful, but it also provoked the United States, and finally was suppressed by the United States, and after dropping two atomic bombs on Hiroshima and Nagasaki, it announced its unconditional surrender. However, the reality is that Japan did not really surrender unconditionally, but put forward three conditions, but all of which were agreed by the United States.
At that time, the United States sent General MacArthur to run post-war Japan, became the commander-in-chief of the US military in Japan, carried out social reforms in Japan, and helped Japan establish a democratic system. After the war, Japan held consultations with its allies for half a month, in which three conditions were proposed, and the United States agreed to these three conditions in order to achieve Japan's interests.
The first is to preserve the emperor system. Japan has long been influenced by militarist ideas, and in order to show its heartfelt feelings to the emperor, it chose to kill itself without completing its task. For the Japanese, the emperor is not only a divine monarch, but also a spiritual leader and patron of the Japanese people. Especially for those fanatics, they can't live without the emperor. If the emperor system is abolished, there will undoubtedly be a big commotion in Japan, which is not conducive to the current rule.
The second is the requirement to dispose of its own war criminals, and if the Allies want to deal with Japanese war criminals, it must be done on Japanese soil. Of course, Japan has also made sufficient preparations for this, creating a large number of perjury to help war criminals alleviate or even escape crimes.
Third, no other country was allowed to station troops in Japan, perhaps because after seeing Germany's situation, Japan itself became vigilant, and with the intervention of the United States, Japan finally got its wish. However, Japan tacitly allowed the US military to be stationed, and no one can say what interests the two sides have. It was also with the help of the United States that Japan's economy developed rapidly after the war, and the United States turned Japan into its ally.