Pearl Harbour.
1941 .
the US joined the war in 1917 and the war ended in 1918. Answer: 1 year.
Germany declared war on the US after Pearl Harbour.
Pick a war.... WWII we joined because of pearl harbor
In 1927
They joined the war in 1917.
They joined the war in 1917.
To end the war.
In 1927
They joined in1941
US
Pearl Harbour.
1941 .
Allied defeat
The us joined ww1 in the year of 1917.
After the US joined WWI, the allies had the forces they need to triumph. The axis powers fell and the war ended.