America's population at the beginning of world war 1 was considered mobilization. After World War One fifth of the world's population was infected.
japan
September 1, 1939 was the official beginning of World War 2.
In world war 1,germany started the war,but in world war 2,japan started it and usa ended the war
japan and Italy
World War 2
Because they did not have WWII
Japan had conflicts with China and Russia before World War one.
See website: Japan
Japan. It was not called World War 1 at the time. It was called The Great War. After World War 1, he went on a World Tour promoting peace. It was the first time a Japanese Emperor had ever left Japan.
because in ww2 Japan joined the axis
Japan