4. How did the Zimmerman Telegram affect the United States participation in WWI?
A. The Zimmerman Telegram made Americans paranoid about fighting Germany, thus strengthening the resolve to stay out of the war.
B. The Zimmerman Telegram did little to change Americans’ minds; the sinking of the Lusitania did much more to motivate them to join WWI.
C. The Zimmerman Telegram, along with the submarine attacks, outraged the American public and strengthened support behind joining the war.
D. The Zimmerman Telegram reaffirmed Mexico’s loyalty to its alliance with the United States, boosting American confidence to join the war.