World War I: Military and Diplomacy

AP US History· difficulty 3/5

The U.S. entered WWI (1917) after

A
$German unrestricted submarine warfare and the Zimmermann Telegram$
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B
$A formal British ultimatum demanding immediate U.S. military entry$
C
$A direct German naval attack on Pearl Harbor and the Hawaiian Islands$
D
$The Russian Revolution prompting U.S. intervention against the Bolsheviks$

Explanation

Germany's resumption of unrestricted submarine warfare and proposal to ally with Mexico (Zimmermann Telegram) pushed the U.S. in.

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