Answer:
Step-by-step explanation:
It was one of the bloodiest conflicts that America engaged in.
It is really hard to give you a decent summary. However, here are the main points.
You have to start with China. The Japanese used 1 million army regulars to occupy China. That effectively took them out of the conflict between America and Japan.
Second. Pearl Harbor. Against his better judgement, Admiral Yamamoto engineered the attack on Pearl Harbor. It was primarily a Naval attack if you absent the fact that Japan's Navy carried the planes within striking distance. It remained a mostly naval war until the end. The Americans respected Yamamoto so much that when they broke the Japanese code, a massive attack was waged against the fleet commanded by Admiral Yamamoto. Little known fact. That happened in April 18, 1943
Third. Midway. Midway was probably the decisive battle in the Pacific. There was lots of fighting that took place afterward, but there was no way Japan could make up for the carrier losses at midway. She just could not match the industrial strength of the United States. Japan had already awoken the sleeping giant, as Yamamoto phrased it.
This is the beginning of your understanding. I have left out the land battles that took place mainly fought by the marines. The Philippines the Mariannas Okinawa are all things you should look up along with Douglas MacArthur and Charles Nimitz. I might recommend Doolittle's raid on Tokyo as well.