Answer:
Step-by-step explanation:
There were huge demands on shipping due to the fact that all supplies had to be moved by sea to many distant islands, and it was difficult to protect supply ships across the vast Pacific Ocean.
Aircraft carriers and submarines mounted a serious challenge to Japan's triumphant fleet and were critical to protecting mainland America. But as US attacks on Japanese naval forces and merchant ships escalated from isolated raids to full-scale battles, the learning curve proved costly and deadly.
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