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.
The U.S.A. officially joined World War 2 when the Japanese attacked Pearl Harbor in 1945.
One of the main reasons that Us joined the war was due to there cruse ship being shot down by some of German submarines
The Zimmermann Telegram, the sinking of Lusitania, and the Russian Revolution.
In 1927
They joined the war in 1917.
They joined the war in 1917.
In 1927
The 8th of December 1941 was the date that the US joined world war 2
They joined in1941
Pearl Harbour.
1941 .
The us joined ww1 in the year of 1917.
joined in 1942