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.
The last country to declare war on Germany during World War II was Brazil. This occurred on August 22, 1942, after German U-boats attacked Brazilian merchant ships, prompting Brazil to join the Allied effort against the Axis powers. Brazil subsequently contributed troops to the Italian campaign, marking its significant involvement in the war.
Depending on who you are you fought in World War 2. World War
No, Chile was the last nation to join. They joined on April 11th, 1945.
The last country to enter World War I was the United States, which declared war on Germany on April 6, 1917. While several nations had joined the conflict earlier, the U.S. decision to enter marked a significant turning point in the war, providing fresh troops and resources to the Allied Powers. The U.S. involvement helped to tip the balance against the Central Powers, contributing to the eventual Allied victory in 1918.
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
Tension
Poland.
I'm kinda sure they invaded Poland.