What was the strategy of island hopping, and what was its purpose?

It was to enable troops to avoid heavily guarded areas and to slowly get closer to Japan. The US had to find a way to go around Japanese defense and this was the way
Hope it helps!

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.