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Britain and the United States declared war on Japan on December 8, 1941.

Bizarre as it may sound, the United Kingdom technically declared war on Japan before the U.S. did. While President Roosevelt spent about a day preparing his war declaration speech*, Prime Minister Churchill felt honor bound to keep a promise to declare war on Japan "within the hour" of learning of an attack on the U.S.

* Literally up to the last hour, FDR's Secretary of State Stinson insisted that the speech be long and detailed. FDR instead chose to do a short and succint speech. Let the record show that people today can even recite the cadence with which FDR stated, "Yesterday, December 7th, 1941 -- a date which wil live IN INFAMY -- the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan."

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11y ago
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12y ago

December 7th 1941, a day which will live in infamy. Pearl harbor was attacked on December 7th 1941 later that day was the Pearl Harbor Address.

EDIT: the United States formally declared war on December 8th, 1941, the day after Pearl Harbor was attacked.

The United Kingdom, Canada also declared war on Japan on December the 8th, while China declared war on Japan on December the 9th.

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Q: What year did The Allied powers declare war on Japan?
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