Because they were fighting in enemy's land.
Germany and Japan mostly
Hitler declared war on the US on 11 December 1942, in the hopes that if they helped Japan fight the US, Japan might help them fight the USSR.
Germany,japan and Italy
Pearl Harbour Bombings
so they can end the war against the japan empire as soon as possible
The US put an embargo on steel, oil, etc. headed for Japan. Can't fight a war without those items.
Because Germany and Japan had signed an agreement to fight together.
The Axis Powers. They were Germany, Japan, and Italy.
Germany and japan
yes as japan attacked pearl harbor
Immediately. We declared war on Japan & then Germany declared war on us.
Germany japan Italy