Question

Which events brought the U.S. into WW1? When did the U.S. join the war, and which side did it support?

Answer 1

I don't remember why they joined the war, but They joined on April 6th, 1917. They Fought With the Allies, Which had Britain, France, And Russia.

Answer 2

The sinking of the Lusitania was one such event along with the general German use of undersea boats (U-Boats) They joined the Allies in April 1917, after ~3 years of struggling to stay neutral.