Mongolia, finally announced its support for the Allies on August 9, 1945. This was after the use of atomic weapons in Japan. There were many neutral nations that joined the Allies as the war was coming to a close. For a complete list of participants see; http://en.wikipedia.org/wiki/Participants_in_World_War_II
Japan.
the catylist that caused America to enter world war two was the bombing of pearl harbour.
Alliances was signed and if one alli declares war first than the other country goes into war.
Depending on who you are you fought in World War 2. World War
World War 2
No, Chile was the last nation to join. They joined on April 11th, 1945.
Germany
Because they were friends with another country that was at war
World War 2 : Japan.
Japan.
The United Kingdom was the first member of the Commonwealth to enter World War 2.
I think it was. Every Country should be trying to help stop such a horrible war
Czechoslovakia
Poland.
Tension
I'm kinda sure they invaded Poland.
Switzerland became a haven for refugees during World War I. People felt safe there knowing the country wouldn't take sides and enter the war.