What event triggered the United States' entry into World War I?

Quiz Options

• The sinking of the Lusitania
• The Zimmerman Telegram
• The invasion of Belgium
• The Russian Revolution

Explanation

While the sinking of the Lusitania contributed to anti-German sentiment, the interception and publication of the Zimmerman Telegram, a secret German proposal for an alliance with Mexico against the US, was a major factor leading to the US declaration of war on Germany.