Why did the japanese bomb perl harbor?

Hawaii is a very important, strategic location because it controls the Pacific Ocean and if the Japanese could take out the US naval fleet in Pearl Harbor, it would be easier to get oil from the Indis 

President Franklin Roosevelt called December 7, 1941, "a date which will live in infamy.". On that day, Japanese planes attacked the United States Naval Base at Pearl Harbor, Hawaii Territory.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.

The third one would be the answer