Japan felt they were superior to the United States and should have more territory and control. The United States was more powerful and stood in the way of them getting the resources they needed like oil and steel to establish more power. In order for them to get safe passage through the harbor to get those supplies. They had to eliminate the threat of Britain and American navy in the Pearl Harbor. So they bombed it e mobilizing them, but not for long. The United States along with some of there allies. Brought Japan down to it’s knees.