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No nation attacked Japan without being attacked first in WW2. The United States was the first country to attack Japan after the Japanese attack on Pearl Harbor.

Japan invaded Manchuria in 1931 and China in 1937. In 1939 Japan invaded Mongolia but were repelled by the Soviet army; the two nations signed a non-aggression pact and were at peace through 1945. Japan's invasion of French Indochina in 1940 overran Vichy-controlled French forces, and the result was a non-aggression pact among Japan, Germany and Italy. Western powers initially responded only with embargoes against Japan.

The Allied supreme command for southeast Asia was formed in early 1942, shortly after the Japanese surprise attack on Pearl Harbor. In April 1942 the US launched the first carrier-based air raid on Tokyo, the 'Doolittle raid' and May saw the first major naval battle at Coral Sea.

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17y ago

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