Which of the following caused the U.S to get involved in WW1?
A. Germany declared war on France and England
B. America's allies declared war
C. Threats to America's security by Germany
D. The assassination of Archduke Franz Ferdinand
The correct answer is C. Threats to America's security by Germany. Although option A (Germany declared war on France and England) and option B (America's allies declared war) were events that took place during World War I, they did not directly cause the United States to get involved. It was the threats to America's security, particularly unrestricted submarine warfare by Germany and the Zimmermann Telegram (in which Germany proposed an alliance with Mexico against the United States) that led to the U.S. declaration of war in 1917. The assassination of Archduke Franz Ferdinand was the event that sparked the beginning of World War I, but it did not directly cause the U.S. to enter the war.
