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the attack on Pearl Harbor wasn't illegal. The attack was a surprise by the Japanese who were dependent on the American supply of oil in the Pacific Ocean.
American aircraft carriers were out at sea at the time of the attack
The Japanese attacked Pearl Harbor at December 7th, 1941, at about 8 A.M.
Japan wanted US out of the out Pacific
The bombing of Pearl Harbor. In Oahu, Hawaii.
The Japanese needed to neutralize the US by attacking Pearl Harbor so that they could expand Japanese interests in the Pacific .
The Japanese attacked Pearl Harbor was to take the American Carriers out of the war to make the Americans vulnerable to attack.
The Japanese commander and planner of the attack on Pearl Harbor was Admiral Isoroku Yamamoto. He remained as an American nemesis throughout most of the Pacific War. He was killed in 1943 when a plane he was in was shot down.
American aircraft carriers were out at sea at the time of the attack
An attack on the main Russian Pacific fleet at Port Arthur during the Russo-Japanese War
There was no declaration before the attack on Pearl Harbor because the Japanese government believed a surprise attack would cripple the United States Pacific Fleet and prevent them from interfering with Japanese military expansion in the Asia-Pacific region. It was seen as a strategic move to gain an advantage in the early stages of the war.
On basic terms, pearl harbor was when the Japanese attacked the American army in Hawaii.