On 7 December 1941, Japanese forces attacked US Military installations at Pearl Harbour on Hawaii. On 11 December 1941, Germany declared war on the US.
The U.S. nuked Hiroshima, then Nagasaki which led to the surrender of Japan by then Emperor Hirohito.
Both were subjected to unprovoked attack, The USSR by Germany and the US by Japan.
Japan's occupation during WW2.
Germany wanted more land for larger population, its military actions led to war. And for Japan wanted natural resources; its military actions led the U.S. to threaten sanctions before Japan launched a surprise attack on it.
There were several events leading up to the US calling for war against Germany. These included the Zimmerman Note, Germany announcing a policy of unrestricted submarine warfare, and the sinking of several American ships.
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.
Germany invaded Poland and Japan invaded China.
After the Japanese attack on Pearl Harbor and the US Decleration of War against Japan, Germany declared War on the US.
there were a lot of wars the japan were in such as world war 1 and world war 2. they also tried to invade Germany
Mainly Pearl Harbor because Japan was an ally of Germany. After Pearl Harbor was bombed the US declard war on Japan and because they were allies Germany and Italy see it fit to declare war on the US.
The Axis forces led by Nazi Germany, and Japan after they entered the war in December 1941
Basically, the bombing of Pearl Harbor. We then declared war afterwards.