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Ferdinand was assassinated by Gaurillo Princip, a Bosnian member of the Black Hand.
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War was declared because it was discovered Serbia supplied the Bland Hand group with the weapons used to kill Archduke Franz Ferdinand.
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Because Russia allied with Serbia in the war that Austria-Hungary started, Germany wanted to protect its alliance with Austria-Hungary and fight against Russia.
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Britain declares war due to Germany invading France through Belguim, which was a country that Britain had port relations with.
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President Wilson believed it violated the law of neutrality.
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The German U-baots fired a torpedo with no worning into the ship. THis resulted with around 1000 British deaths and around 250 American deaths.
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The Zimmermann not is intercepted by the British who share it with the US. The note is from Germany to Mexico that states if Mexico fights with America, then the US won't enter the European War.
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German sinks 3 American merchant ships with U-boats. Brings America into war.
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