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Archduke Franz Ferdinand assassinated
Blank Hands wanted to kill him
Austira HUngray then declares war -
Germany declared war on Russia
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Germany declares war on France
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America was trading supplies with other countries and Germany was causing problems with being able to access the other countries
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German U boat torpedoes a British passenger liner 128 Americans die
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Submarine Warfare led US to strengthen military
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Propaganda on Germany to influence America
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Germany reversed its policy on submarine warfare
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Zimmerman telegram
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Germans attacked and sank 4 American ships