During WWI, the US joined the side of the Allied Powers (Allies), along with Great Britain, France, Russia, Japan and Italy, on April 2, 1917. However, the US joined at the end of the war, so they had the least amount of casualties.
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The US was neutral during much of World War I, and didn't formally declare war on the Central Powers until 1917, when the war was in it's third year.
remained neutral
It was Germany
They were "Doughboys".
the sinking of lusitania
It was Triple Entente.