Answer:Japan attacked the US because it wanted to take over more land and resources in Asia and the Pacific. The US stood in its way.The US and Japan were on a collision course because: * Japan wanted to build a big empire in Asia. It needed resources like oil, which the US had and controlled access to. * The US tried to stop Japan's expansion. It put limits on what the US would sell to Japan, like oil and metal. * Japan felt it had to act. It thought attacking the US Pacific Fleet at Pearl Harbor would weaken the US and give Japan time to take over Southeast Asia before the US could fight back.