194 1 1 On February 7th, during World War II, the Japanese army raided Pearl Harbor, the naval base of the US Pacific Fleet, thus opening the prelude to the Pacific War.

After the Lugouqiao Incident on July 7th, the Japanese army began to invade China in an all-round way.

In a short period of time, it occupied a large area of land in China and used China as the base for the Soviet Union to enter the North, South, Southeast Asia and the Southwest Pacific.

As War of Resistance against Japanese Aggression entered the stalemate, the invasion of the Soviet Union was frustrated, and the Japanese high command was overwhelmed by the simultaneous operations of both sides.

After the outbreak of World War II, with the development of the European war situation and the signing of the trilateral alliance treaty between Germany, Italy and Japan.

The Japanese high command took advantage of the favorable opportunity that Britain and France were busy with the European war and turned to the policy of attacking the south and defending the north. 1941On June 22nd, the German army invaded the Soviet Union, and the outbreak of the Soviet-German war relieved the worries of Japan's southward advance.

At the beginning of July, Japan's high command made plans to further expand its offensive operations in Southeast Asia and launch the Pacific War.

Because Japan's southward attack directly threatened the interests and privileges of the United States in the Pacific Ocean, the United States government adopted some economic sanctions.

In this way, the contradiction between Japan and the United States has become increasingly acute.

In order to defend its vested interests in the Asia-Pacific region, the United States has set up a huge fleet of hundreds of ships with Pearl Harbor as its main base and activity center.