SAT Subject US History Practice Question 1087: Answer and Explanation
2. The immediate cause of the United States's entrance into World War I was the
A. assassination of Archduke Franz Ferdinand of Austria.
B. announcement by Germany of the use of unrestricted submarine warfare.
C. sinking of the Lusitania.
D. Zimmermann Note.
E. attack on Pearl Harbor, Hawaii.
Correct Answer: B
Germany announced that it would resume unrestricted submarine warfare and violate the Sussex Pledge, and this was the immediate reason for the U.S. entry into World War I. The assassination of Archduke Franz Ferdinand of Austria by a Serbian nationalist was the immediate cause of World War I in Europe but not the reason the United States entered the war. The sinking of the Lusitania occurred in 1915, and some Americans were killed. However, the United States didn't declare war until 1917. The Zimmermann Note was intercepted in 1917 but was not the immediate cause of U.S. entry into the war; the issue of freedom of the seas and submarine warfare was. The attack on Pearl Harbor, Hawaii, was the immediate cause of U.S. entry into World War II.