The history of World War II is relatively transparent, and every war process can be queried in historical materials. It's hard to beat the history teacher. We can find another way and ask some military questions, such as why Japan could defeat the American troops in Southeast Asia so easily at the beginning of World War II and take the initiative in the previous wars. Reason: After World War I, countries should not build their own navies like today's nuclear weapons, but they should avoid other countries threatening their own countries. So countries discussed a clause about the comparison of naval ownership, and the imaginary enemy of Britain in Asia was 5: 5: 3: 3:1.75:1.75. Therefore, after signing this agreement, Britain put forward a supplementary clause, requiring the US troops stationed in Asia not to build various defensive measures. At that time, considering that the Pacific fleet could reach Asia to solve the battle within two weeks when the Pearl Harbor War broke out, the US military also considered it unnecessary. As a result, Japan attacked Pearl Harbor. At the beginning of the South Asian War, the US military counted on the Pacific Fleet to repair the hole in Pearl Harbor. Without backup and ground defense measures, the us military naturally suffered a crushing defeat.