The US entered the war in April of 1917 and were on the Allies side.
One of the main reasons the US entered World War I on the side of the allies was because the Germans had sunk the Lusitania, a passenger ship containing many Americans.
Lend-Lease.
Over the years, the United States had many motives for going to war. The nation has gone to war to protect itself, gain economic benefits, aid it's allies expand it's borders, or increase it's power and infulence. This answer can also be used for why the united states decide to enter the war and fight on the side of the Allies.
Many things might have lead up to it but one of the main things was a german submarine sunk an american ship without warning No American ships were sunk by the Germans. The ship in question was the British Lusitania. 128 Americans aboard drowned when it sank. The Zimmermann Note was also a factor and the war debts owed to the US by the Allies that would be impossible to repay if the Allies lost could be considered the most significant motivation.
The US entered the war in April of 1917 and were on the Allies side.
The US joined the war on the side of the Allies on April 6, 1917.
they needed more back up , and the felt that they were more on their side then anybody else
they needed more back up , and the felt that they were more on their side then anybody else
The Germans sunk 7 US ships, and we intercepted a telegram from Germany that said they planned to attack us.
allies
The Irish-Americans possibly did not like Great Britain
The sinking of the Lusitania by the German U-boat and the Zimmermann note made the United States want to enter the war (on the Allies side)
Allies
allies
South Korea
Allies