Japan's joint fleet hit the US Pacific fleet hard and took control of the Pacific Ocean. Subsequently, Japan frequently launched an offensive against the United States, which embarrassed Americans. In fact, all this is the fault of Americans, because Americans have been supporting tigers. An important reason why Japan can sneak attack on Pearl Harbor in the United States is that the United States has been providing strategic materials to Japan before. Most of Japan's scrap steel, copper, oil and other resources come from the United States. For example, most of the fuel used by the Japanese navy is provided by Americans. Without the United States, Japan would not be able to meet the most basic oil demand, nor could it secretly attack the United States. In fact, during World War II, Japan was ambitious and launched a crazy aggression in Asia.

The United States is not ignorant of Japan's ambitions, but Americans are still going their own way, and they continue to provide strategic materials to Japan. Then, knowing that Japan is ambitious, why does the United States still provide Japan with a large number of strategic materials? The United States provides strategic materials to Japan mainly for its own interests. Japan is one of the most important trading partners of the United States. The United States is Japan's largest trading partner. Three quarters of Japan's imports come from the United States. Japan imported a lot of materials from the United States, which was very helpful to restore the American economy hit by the Great Depression. Because of economic interests, Americans will naturally not give up trade with Japan. During World War II, the United States made a lot of money by fighting with Japan. It was not until Japan's financial difficulties, foreign exchange dried up, and there was almost no oil and water to squeeze, that the United States gradually stopped providing oil to Japan and began to sanction Japan.

Although the United States has provided strategic materials to Japan, it is not defenseless. On the one hand, the United States constantly strengthens the strength of the Pacific fleet and closely monitors Japan's movements. On the other hand, American exports to Japan are mainly limited to oil, scrap steel, machinery and equipment, and most of them are within the normal trade scope. In addition, the United States not only provided Japan with materials, but also provided Japan with a large number of loans and materials to China, using China to contain Japan and achieve a strategic balance. When Japan was mired in war, the United States harassed Japan with trade sanctions and forced it to return to its pre-war state, which angered Japan. Angry Japanese jumped off the wall and attacked Pearl Harbor in the United States.