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The United States went to war with Japan because of their attack on Pearl Harbor on Dec. 7, 1941. The U.S. was more or less expecting war with Japan at some point, but not at the time and place the war began.

After President Roosevelt's speech to Congress on Dec. 8, 1941; Congress declared war on Japan. The 470 for and 1 against (the sole vote against came from a profound pacifist Representative. She later voted for war against Germany and Italy [or was not present during those votes]).

The United States went to war with Germany after Germany declared war on the United States on Dec. 11, 1941. The Congressional vote for this declaration was unanimous.

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11y ago

Japan and Germany were the two great fascist powers in WW II (with Italy coming up third) and both of these countries were at war with Britain (Japan attacked the British colony of Hong Kong). The US had already been through WW I as an ally of Britain, and was very close, culturally and economically, to Britain and to other countries that were allied to Britain, Canada in particular. Even though Germany and Japan were not formally allied, they did see themselves as being at least allies of convenience, since they had common enemies. Therefore it made military sense for the US to go to war with both Imperial Japan and the Third Reich. Aside from that, the US did not really want to see the continent of Europe ruled by a vicious and ruthless Dictatorship, which sooner or later might turn its attention to the US.

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Germany and Italy were honoring the non-aggression pact that they had signed with Japan .

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Q: Why did Germany and Italy declare war at the same time the US declared was on japan?
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When did Germany and Italy declare war on the US?

Germany and Italy declared war on the US on Dec. 11, 1941 after the US declared war on Japan because of the bombing of Pearl Harbor on the 7th. The United States never did declare war on Germany/Italy.


After the US declared war on Japan what other two countries declared war on the US?

After Japan attcked Pearl Harbor we declared war of Japan, and Germany.


Why did Germany declare war on the United States after the United States declare war on Japan?

AnswerThe USA had already given a huge amount of aid to the British and Soviet Union and was openly hostile to the ambitions of Germany. On an ideological level America was viewed as an inferior, racially mixed nation.Germany and Italy had signed a pact with Japan agreeing to cooperate in establishing a new order with Germany and Italy controlling Europe and Japan controlling East Asia.The pact also guaranteed support if any country attacked one of the Axis powers, technically once the USA had responded to the Japanese attack on Pearl Harbour by declaring war on Japan, Germany was bound to offer support to Japan.


What country made the allies declare war on Germany?

Japan, bro. Japan declared war on America not Germany. Canada declared war on Germany on the 10th of September.


Why did the Australian government declare war on Japan Germany and Italy?

The Australian government declared war on Japan Germany and Italy because they're part of the British Commonwealth, the declared war when Britain did. This also applied to New Zealand, South Africa, Canada and India, to name the bigger countries in the Commonwealth.

Related questions

What did Germany and ltaly declare war on the United States?

As allies to Japan, Germany and Italy declared war on the US when the US declared war on Japan the day after the bombing of Pearl Harbor.


When did Germany and Italy declare war on the US?

Germany and Italy declared war on the US on Dec. 11, 1941 after the US declared war on Japan because of the bombing of Pearl Harbor on the 7th. The United States never did declare war on Germany/Italy.


When did Germany and France declare war on the us?

France never declared war on the US. it was part of the allies. Germany, Italy & Japan declared war in 1941-1942 on the US


Why did Germany and Italy declared war in the us?

After Japan bombed Pearl Harbor we declared war on them. Germany was an ally of Japan so they declared war on us. Italy was an ally of Germany so they went along with Germany and declared war.


Why did Italy and Germany declare war on the US?

After the US declared war on Japan because of Pearl Harbor Germany/Italy in turn declared war on the US.


Did Japan attack the US after the US declare war against Japan's ally Germany?

No. Japan attacked the US on December 7, 1941; Japan declared war that same day.On December 8th, the US Congress declared war on Japan after FDR's memorable "Day of Infamy" speech.On December 11th, Germany and Italy declared war on the US, since they were allies of Japan. Later that same day, the US Congress declared war back on Germany and Italy.


When did US declare war on Germany and Italy in World War 2?

America didn't declare war on Germany and Italy, it was the other way round. As part of the Axis Pact, once war was declared between the empire of Japan and the United States, Germany and Italy declared war on America on the 11th of December 1941, 4 days after the attack on Pearl Harbour.


After the US declared war on Japan what other two countries declared war on the US?

After Japan attcked Pearl Harbor we declared war of Japan, and Germany.


Why did Germany declare war on the United States after the United States declare war on Japan?

AnswerThe USA had already given a huge amount of aid to the British and Soviet Union and was openly hostile to the ambitions of Germany. On an ideological level America was viewed as an inferior, racially mixed nation.Germany and Italy had signed a pact with Japan agreeing to cooperate in establishing a new order with Germany and Italy controlling Europe and Japan controlling East Asia.The pact also guaranteed support if any country attacked one of the Axis powers, technically once the USA had responded to the Japanese attack on Pearl Harbour by declaring war on Japan, Germany was bound to offer support to Japan.


What country made the allies declare war on Germany?

Japan, bro. Japan declared war on America not Germany. Canada declared war on Germany on the 10th of September.


Why did the Australian government declare war on Japan Germany and Italy?

The Australian government declared war on Japan Germany and Italy because they're part of the British Commonwealth, the declared war when Britain did. This also applied to New Zealand, South Africa, Canada and India, to name the bigger countries in the Commonwealth.


Why did japan invade germany?

Japan didn't invade Germany. During World War II, Japan actually joined Germany. It was part of the Axis which included Germany, Italy and Japan. After the United States declared war on Japan, Italy and Germany, as Japan's allies, declared war on the United States.