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U.S. Entry into World War I

This New York Times headline reads "Lusitania sunk by a submarine." The United States declared war on Germany on April 6, 1917. (U.S. Air Force photo)

This New York Times headline reads "Lusitania sunk by a submarine." The United States declared war on Germany on April 6, 1917. (U.S. Air Force photo)

The United States declared war on Germany on April 6, 1917. Although the reasons were varied and complex, the one having the greatest emotional impact upon the "average American" was Germany's introduction of unrestricted submarine warfare following the sinking of the Lusitania in 1915.

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