government severed all commercial and financial relations with Japan. In July 1941, by which time the Japanese had occupied all of Indochina and had entered into an alliance with the Axis powers ( Germany and Italy), the U.S. Between June 1940 and the fateful crisis of December 1941, the tension constantly mounted. began to restrict the export to Japan of materials useful in war. Beginning in the summer of 1940, the U.S. announced the termination of the 1911 Treaty of Commerce and Navigation with Japan. Contunico © ZDF Enterprises GmbH, Mainz See all videos for this article Nazi Germany invading the Soviet Union in Operation Barbarossa, June 22, 1941. In response, the United States government extended its first loan to China in 1938. A clash at the Marco Polo Bridge near Beijing on July 7, 1937, signaled the beginning of open warfare between Japan and the United Front of Chinese Nationalists and the Chinese Communist Party. As early as 1931 the Tokyo government had extended its control over the Chinese province of Manchuria, and the following year the Japanese cemented their hold on the region with the creation of the puppet state of Manchukuo. In the late 1930s, American foreign policy in the Pacific hinged on support for China, and aggression against China by Japan therefore necessarily would bring Japan into conflict with the United States. The strike climaxed a decade of worsening relations between the United States and Japan. naval base at Pearl Harbor on Oahu Island, Hawaii, by the Japanese that precipitated the entry of the United States into World War II. Pearl Harbor attack, (December 7, 1941), surprise aerial attack on the U.S. The USS Arizona Memorial is one of the most visited tourist attractions in Hawaii. The USS Arizona remains where it sank on December 7, 1941, and it is preserved as a national cemetery. Adjacent to the harbour is Hickam Air Force Base, and the two installations were merged in 2010 to become Joint Base Pearl Harbor–Hickam. Navy base on the Hawaiian island of Oahu and the headquarters of the U.S.

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