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Germany sank the Lusitania of the United Kingdom on May 7th, 1915, killing 114 Americans.
Germany practiced "Unrestricted Submarine Warfare" - a tactic in which submarines sink ships without warning that approach their waters.
The Sussex pledge was a promise by Germany not to sink unarmed ships and to ignore passenger ships.
The Zimmermann Telegram from Germany proposed a military alliance between Mexico and Germany if the US joined the war against Germany
The United States of America enters WWI.
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