07 December 1941-02 September 1945. Approximately 3 years and 9 months.
America didn't fight in world war 1
world war 2
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.
world 2 war
America contributed to World War 1 before 1917 by supplying the warring countries with military goods. This led to an economic boom that sustained America's war spending when it eventually entered the war.
America.
6 years
3 minutes 24 seconds
Harry Truman.
From the beginning to the end.
Israel didn't exist during World War II.
Didn't start yet.
4 long years
approximately 1939 to 1945
from 1900 to world war II
it ended in 1918
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