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Woodrow Wilson, the president of the United Staes, declared his country to be neutral.
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A German U-boat torpedoed the British ship, the Lusitania, containing more than 120 Americans. This event turned lots of public opinion against Germany.
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An agreement called the Sussex Pledge was made between Germany and the U.S. stating that if Germany contiues to harrass Americans, then diplomati relations with them would be broken.
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This secret telegram was sent on this date by Germany asking Mexico to join the war and be their ally.
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The Sussex Pledge ended afer Germany violated the agreement between them and the United States.
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After Germany continued to target American ships, it swayed the public opinion of America and their opinion on the declaration of war.
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America finally declared war on Germany on this date
