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On this day, Archduke Ferdinand was assassinated while visiting Sarajevo.  There was a rebel group called the black hand that wanted to kill Archduke Ferdinand, and put 6 assassinators when he was visiting Sarajevo.

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Austria presents Serbia with an ultimatum, backed by Germany.  They demanded that Serbia public ally condemn the ‘dangerous act’ against Austria-Hungary.

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Serbia accepts most but not all of Austria’s demands. They accepted that Austrian officials could take part and help in the investigation of the assassination of Archduke Ferdinand.

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Austria rejects Serbias offer and declares war on Serbia. Austria wanted to demonstrate their own power after their duke was assassinated y Serbia.

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Russian leaders order mobilization of troops and move them toward the Austrian-border. Tzar Nicolas II tells Kaiser
Wilhelm II that the moves are only a precaution.

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Germany declares war on Russia. They did this becuase they were in support of Austria and were therefore obligated, by their treaty to support Austria in war.

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Germany demands France to stay neutral but France stays with its ally, Russia. France was also in a treaty at this time, and was obligated to fight and stand with Russia.

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Germany responds by declaring war on France. Since France didn’t listen to Germany demand to stay neutral, Germany responds in a harsh way, by declaring war.

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Germany army invades Belgium on its way to France. They did this to avoid the French fortifications near the France-Germany border.

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Great Britain, honoring a treaty guaranteeing Belguim’s neutrality, declares war on Germany. This happened because of the obligations made by the Triple Ente and Triple Alliances, which launched the entire continent of Europe into war.