Officially, the U.S. entered the war in December 1941. Unofficially, the U.S. was helping England and the Allies from pretty much the beginning; supplying weapons, materials, and other resources.
1939
australians involvment in ww1
September 1939
if you were trying to say did the year world war one increase the production of cotton and copper the answer is yes
World War I was from 1914 to 1918, US involvement was 1917 to 1918.
The United States involvement lasted from 1917-1919.
In 1950.
1945
December 7th 1941
Increased involvement in the war
in the year of 1999 the us had the war.
1939
1939
1914
1941
the cause
There was none....