Answer:
Pearl Harbor was selected for the location of a naval base because its location west of Honolulu, capital of the state of Hawaii, allowed the United States to control the Pacific Ocean from a base located in the vicinity of an important city in the country, which provided greater ease of supply to the forces deployed there.
In addition, the Pearl Harbor area is comprised of a lake connected to the ocean through a river, which forms a natural port that requires very little labor to be suitable for military use.