In the Spring of 1917, the Course of the War

Multiple Choice

In the spring of 1917, the course of the war was changed by

A) German submarines breaking British blockades.
B) Turkey's collapse and the U.S.entry into the war.
C) Russia's collapse and the U.S.entry into the war.
D) the use of the machine gun in trench warfare.
E) Germany's movement to isolate the British from their other allies.