Question

What two events caused the U.S. to enter WWI?

a
Germany being blamed and Italy switching sides
b
Dustbowl and Crash of 1929
c
Wolves running in the parking lot and Mr. Duarte taking over teaching us
d
Unrestricted Submarine Warfare and The Zimmerman Telegram

Answer 1

d — Germany's unrestricted submarine warfare and the Zimmermann Telegram. These actions (sinking of ships, including U.S. lives, and Germany's proposal that Mexico join them against the U.S.) pushed the U.S. to declare war in April 1917.