Japan attacked the US without Germany even knowing about it. Germany declared war on the US on December 11, 1941. Japan probably didn't even know about that until it happened. Hitler had invaded Russia in 1941 and no doubt was hoping Japan would open a second front on the Russians as a favor for him declaring war on America.
Japan wasn't in WW1.
Britain, France, Russia & the US are common to the Allies in both WW1 & WW2. They are opposed by Germany in both wars. In WW1 Italy & Japan were both on the side of the Allies, in WW2 they were on Germanys' side. Turkey was on the side of Germany in WW1 & Neutral in WW2. Austria/Hungary was on the side of Germany in WW1 & were also on Germanys' side in WW2, (although it might be said by force rather than choice.) although they were then 2 separate countries.
Germanys
Japan was on the Axis Powers side in World War II.
Not too sure about Italy, but Japan were on the Germans side and got the USA to enter the war by attacking Pearl Harbour! Hopefully that gives you some help!
No - Japan, Italy and Germany were on one side and the rest of the world on the other.
Japan
Germany and Japan were on the same side in World War II.In World War I Japan was on the Allied side and fought against Germany.
Britain's side
Japan was officially on the same side as the Germans although it was a very unlikely alliance. Thailand was Japan's ally in Asia.
japan
Japan was part of the Axis, which included Italy and Germany.