Answer:
To cripple the U.S.'s navy
Step-by-step explanation:
With the U.S. out of the way, Japan could take over the pacific with ease. Pearl Harbour ended up being a terrible disaster for Japan. The bombers did not hit their primary objective, the oil fields, or their secondary objective. The cherry on top is that roughly 80% of their oil came from America. this ultimately doomed Japan to lose the war.