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President Woodrow Wilson officially announced the United States as neutral in the war.
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German U-boats sink the Lusitania, and 1.198 civilians were killed. (128 americans)
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Germany responds to President Woodrow Wilson by agreeing to limit its submarine warfare in order to avert a diplomatic break with the U.S.
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The United States intercepted a note from Germany to Mexico asking to make an alliance against the U.S. It was translated by the British for the U.S.
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Germany redeclares unrestricted submarine warfare.
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3 more U.S. trade ships were targeted and sunk by German U-boats.
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Congress authorizes a declaration of war against Germany, the U.S. enters war as allies with France and Britain.
