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The Archduke was assasinated by a young Serbian boy who was a radical. This lead to rash anger.
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A whole month after the assassination of the Archduke, Austria-Hungary declares war on Serbia.
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After invading Belguim to get to France, the angered UK declares war on Germany
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Germany sinks the Lusitania, killing many innoce Americans and making America Suspicious.
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For the sinking of cargo ships and the death of innocent American people.
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Fighting ends on the battle field.
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