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Pearl Harbor was attacked by Japan. Their first purpose was to destroy important American Fleet units.
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United States declares war on Japan because Japan Bombs Pearl Harbor in Hawaii. When Japan had attacked Pearl Harbor, President Roosevelt declared war with Japan in response for the surprise attack on Pearl harbor. He had declared war one hour after the Infamy speech.
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Battle of the Java Sea begins. Between Japanese and the U.S. Battles are occurred because they are at war.
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First U.S. troops arrive in Australia, because they were an important base.
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The last U.S. Troops holding out in the Philippines surrender on Mindanao. The battle of Mindanao was to conduct the recapture of the southern most portions of the archipelago.
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The first U.S aircraft lands on Guadalcanal. Japaneses attacks Guadalcanal and the U.S wanted to help them against the Japanese.
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The U.S has victory over Japanese in the Battle of Bismarck Sea. This battle occurred because they are at war.
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U.S. begins submarine warfare against Japanese shipping, because they are at war.
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U.S. Carrier-based and land-based planes destroy the Japanese base at Rabaul.
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U.S. Carrier-based planes attack the Mariana Islands, because there were Japanese troops there.
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President Roosevelt dies, succeeded by Harry S. Truman. President Roosevelt died from Polio.
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The first U.S. Naval bombardment of Japanese home islands. It was hoped that the Japanese military would respond to these bombardments by attacking the Allied forces with the aircraft that were being held in reserve to respond to the planned invasion of Japan
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The United Nations was born because it was a necessity to have in order to improve arbitrating international conflict. It was also helpful to negotiate peace that was provided by the older League of Nations.
