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Japan attacked the US Fleet at Pearl Harbor, Hawaii on December 7, 1941. The following day, President FDR delivered his "Infamy Speech," declaring asking Congress to declare war on Japan because of the brutality of an unprovoked (in most American's opinions) attack.

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12y ago
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11y ago

Germany was attacking merchant ships in the Atlantic.

The USA did not declare war on Germany until drawn into war by the Japanese attacks on Pearl Harbour, - attacks on merchant shipping had little to do with declaration of war.

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16y ago

As President of the US, Franklin Roosevelt said to Congress after Pearl Harbor "since the unprovoked and dastardly attack", there was little else to do.

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13y ago

America declared war because of the attack o Pearl Harbor

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13y ago

Japan bombed Pearl Harbor, causing the US to declare war on Japan.

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12y ago

After the surprise attack on Pearl Harbor, they really had no choice.

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Q: Why did the Japanese declare war on the US during World War 2?
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Continue Learning about General History

During World War 1 when did Serbia declare war?

an act of terrorism


When did the Japanese formally declare war during Pearl Harbor?

they didnt, we declared war on them for attacking us. they "provoked" us to declare war, though we provoked them first by taking away their oil


Were the Japanese cannibals during world war 2?

No


Who held the Japanese during world war 2?

America held the Japanese in camp during WW2


Who did the US declare war on when they entered World War 2?

The United States was bombed by the Japanese at Pearl Harbor which cause a declaration of war but Germany had an alliance with Japan and it had forced the United States to declare war on Germany too. Then Germany had an alliance with Italy which cause the United States to declare war on yet another country. Then the world was at war and therefore World War 2 started.

Related questions

What event caused the us to declare war?

The Japanese bombing the U.S fleet at Pearl Harbour, Hawaii on the 7th December 1941 is what ultimatley caused the U.S to declare war during world war 2.


What date did US declare war on Japan during world war 2?

December 8, 1941, the day after the Japanese attacked Pearl Harbor


During World War 1 when did Serbia declare war?

an act of terrorism


When did the Japanese formally declare war during Pearl Harbor?

they didnt, we declared war on them for attacking us. they "provoked" us to declare war, though we provoked them first by taking away their oil


Did Thailand declare war on the US and Great Britain in 1942 during world war 2?

No. Thailand was a separate region known as Siam under Japanese control. It had no authority over its decisions.


Which year did the Soviet Union declare war on Japan during World War 2?

1945


Did Ronald Reagan declare war on world war 2?

No, he was an actor all during the war. Franklin Delano Roosevelt was the President during the war.


Was the Japanese in World War 1?

An allied power during that war.


Who were affected during world war 2?

The Japanese


Were the Japanese cannibals during world war 2?

No


Who held the Japanese during world war 2?

America held the Japanese in camp during WW2


Who did the US declare war on when they entered World War 2?

The United States was bombed by the Japanese at Pearl Harbor which cause a declaration of war but Germany had an alliance with Japan and it had forced the United States to declare war on Germany too. Then Germany had an alliance with Italy which cause the United States to declare war on yet another country. Then the world was at war and therefore World War 2 started.