President woodrow wilson was re-elected in 1916 with the of the slogan “he kept us out of the war.” the next year, however, he led the united states into the war on the side of the allies. which of the following contributed to american involvement in the war?
a
the sinking in 1915 of the british liner lusitania
b
the halt of unrestricted german submarine warfare in 1917
c
a german attempt to turn canada against the united states

why did russia leave the war in 1917?
a
russia was defeated by germany.
b
russia was defeated by france
c
tsar nicholas ii abdicated after the communist revolution in russia and signed a peace treaty with the central powers.