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Archduke Franz Ferdinand was assasinated by Gavriolo Princip pf Serbia
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The waters around the british isles were to be consideredan official war zone and germany would sink any ship that entered the area
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British passeneger ship [sister ship of the Titanic] was torpedoed and sunk by a German submarine killing more than 120 americans
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Germany pledges not to s\ink any more merchant ships without warning.
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Germany resumes U boat atttacks on the U.S.
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Germany sent Mexico a telegram telling them to attack the U.S. in exchange for TX, NM, and AZ.
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After the Zimmerman Telegram, that was the last starw
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The government now has the power to draft soldiers.