There's a lot of reasons. One big reason is the sinking of the Lusitania.
The Germans sunk the lusitania and killed british and American citizens.
depends on who us is
World War 2
The US joined the war on the side of the Allies on April 6, 1917.
archduke ferdinand
The US entered World War 1 on April 6, 1917. The war ended about one and a half years later.
The US entered when it declared war on Germany on April 6th 1917. So they entered late.
The US did enter World War 1, though not till 1917.
Congress and the president also a lot of Americans wanted us to enter world war one
us(united state ) enter to the war.
The sinking of the Lusitania was a big one.
the us decided to enter world war because they want the resources of france, and they want to keep on ruling france.
1917
no
1941
No
pearl harbor
1917 smart
1941