Nazi Germany and Japan .
which war?
Italy, Japan, and Germany
britain
Mussolini
England/Great Britain
Britain and Germany were effected because they were at war against each other.
Britain, France, Italy, Russia (dropped out in the war), USA ( eventually joined in 1917), and 21 smaller countries.
Mainly the Axis powers. Britain, and many countries in America and elsewhere, fought against them.
The US were supporting Britain from the start of the war, but were not directly involved in the war. Germany attacked US ships that were carrying support to Britain. So the US joined the war with the allied powers against the Axis powers. US enemies were the Axis powers who were Germany, Italy, Japan, Hungary, Romania and Bulgaria.
The USA fought with Britain in World War 2 against Japan and Germany. Later Russia joined the war after Hitler murdered innocent Russians to try and take control of Russia. USA and Britain fought Japan and defeated them with a massive atomic bomb being used by the Americans. Russia fought against Germany: The USA and Britain joined to help Russia.
allied countries (great Britain,France,russia and japan joined in weeks later,and Italy joined later)
The alliance was between Britain, France, and Russia. Later joined the United States during World War I.