What was the most compelling cause of US intervention in World War I on the side of the Allies?

Name: What was the most compelling cause of US intervention in World War I on the side of the Allies?
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The most compelling cause of US intervention in World War I on the side of the Allies was the German use of unrestricted submarine warfare, which included attacks on civilian and neutral ships, most notably the sinking of the Lusitania, which directly affected American citizens and trade.

What Was the Most Compelling Cause of US Intervention in World