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Archduke Franz Ferdinand and his wife Sophie visit Sarejevo to deliver a speech.
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Nedjelko Cabrinovic attempted to assassinate Archduke Franz Ferdinand and Sophie by throwing a bomb at their car. The bomb rolled off the back of the car and injured an officer.
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After the speech, Franz Ferdinand and Sophie went to visit the injured officer at the hospital. On the way the driver took a wrong turn, passing Gavrilo Princip. Gavrilo seized his opportunity and fired two shots into the car killing Franz Ferdinand and Sophie.
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After the assassination, Austria-Hungary gave Serbia an ultimatum. If they declined the ultimatum, then Austria-Hungary would declare war on Serbia.
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Serbia declines Austria-Hungary's requests in the ultimatum, so Austria-Hungary declares war on Serbia.
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World War I begins because Serbia declined Austria-Hungary's ultimatum.
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Germany declares war on Russia.
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Germany declares war on France.
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Great Britian declares war on Germany.
