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Step 1Here's a clear, structured explanation of the three main reasons the United States entered World War I:
Step 2: Unrestricted Submarine Warfare
The German policy of conducting unrestricted submarine warfare was a critical provocation. Germany's submarines were sinking merchant and passenger ships, including those with American citizens on board. The most famous incident was the sinking of the British passenger ship Lusitania in 1915, which killed 128 Americans.
Final Answer
1. Unrestricted submarine warfare by Germany 2. The Zimmermann Telegram's proposed Mexican alliance 3. Protecting democratic ideals and economic interests
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