The reason for this result is undoubtedly the financial gap. The US military could be said to be completely and truly wealthy at the time. From the beginning of World War II. The U.S. military's logistics supplies can be called very luxurious. It is no exaggeration to say that many people believe that the U.S. military's victory depends most not on advanced weapons, but on their own strong logistics support capabilities. Jokingly speaking, the logistical support alone can make others angry to death. Of course this is just a joke. Since the beginning of the Pacific War, the U.S. military has used airdrops to drop large amounts of supplies to front-line positions. According to relevant statistics, the amount of material dropped by the United States at that time can be said to be the country with the largest number of airdrops during World War II. The initial release of supplies by the United States was not only to meet its own needs during the war, but also to send a large amount of supplies to other allies. China also received a large amount of aid supplies from the United States during the Anti-Japanese War. Therefore, in terms of combat material delivery and output capabilities, Britain, France, Germany and the Soviet Union at the same time can be said to be far behind the United States. A large amount of material investment needs to be based on a strong economy. As we all know, the United States made a fortune by reselling strategic materials during World War I. From being an out-and-out debtor country at the beginning, it has transformed into a creditor country. In the early days of World War II, as a safe country outside the war, the Allies deposited their own foreign exchange reserves and gold reserves in the United States. The United Kingdom alone shipped 1.8 billion pounds of gold and bonds to the United States. It even includes German and Italian scientists and European scientific researchers, which indirectly leads to the strength of the United States. Therefore, when World War II was intense, the United States could be said to be the richest country. This also caused what we said at the beginning was the gap between the United States and the British army in terms of toilet paper. Faced with such a gap, the British military also ridiculed the American military, saying that Americans have big butts.