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The attack of Pearl Harbor was on the morning of December 7th, 1941, but Roosevelt asked congress to declare war on Japan on December 8th, 1941 but in my History book it states, " Three days later, Germany and Italy declared war on the United States and congress declared a state of war with them too."

This leads me to believe that the date is December 10th, 1941 that Roosevelt was able to declare war on Japan.

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13y ago
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16y ago

The Japanese declared war on the USA a small time before they made a sneak attack on Pearl Harbor in America but never told us.

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Q: When did the Japanese formally declare war on the US?
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If you mean in WWII then this is what I have got. Germany did not actually declare war on the Americans. When the Japanese bombed Perl Harbour in America the Americans wanted to declare war on the Japanese but the British persuaded the Americans that it was the Germans that started it and so the Americans declared war on the Germans and any other army with them including the Japanese on 11th December 1941. Hope that helps! =)


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