Final answer:
The US entry into World War I was influenced by submarine warfare, the Zimmerman Telegram, public opinion, and concerns about a potential German victory.
Explanation:
Events Leading to US Entrance into World War I:
- Submarine warfare and Zimmerman Telegram inflamed public opinion
- Congress declared war on Germany on April 4, 1917
- US entered war unprepared and needed time to build military forces
- President Wilson feared imminent German victory would alter power balance
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