Pearl Harbor.
The immediate cause was Japan's attack on Pearl Harbor. This caused the US to declare war on Japan, which led to Germany and Italy declaring war on the US.
On December 7th, 1941 (a date which will live in infamy), the Empire of Japan bombed the US naval base at Pearl Harbor. This caused the US to declare war on Japan.
The US was forced to declare war on Japan in DECEMBER 9, 1941
Japan
the German capital would be divided into four partsApex
the us didn't declare war on china in world war 2 us declared war on japan on 1941 when japan bombed pearl harbor hawii
Answer this question… Germany's pact with Japan caused it to declare war on the United States.
I believe it was December 8, 1941, the day after pearl harbor was attacked by the Japanese.....
On Japan.
Any country can declare war on anybody else. What matters is can you back it up?
after japan attacked pearl harbor and declared war on japan a German Allie
Because of Pearl Harbour.