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Some people may say that the alliance systems were the reason for the war starting because of their constant rivalries but the alliance systems were created seven years before the death of Ferdinand and did not cause a lot of huge events like an assassination.

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Austria declaring war on Serbia was the start of war. Russia then declared war on Austria-hungry, Germany declares war on Russia and France and Great-Britain entered neutral Belgium. " Within a week, Russia, Belgium, France, Great Britain and Serbia had lined up against Austria-Hungary and Germany, and World War I had begun" (History.com)

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On July 18th, 1914 Austria rejected Serbia's offer and declared war. Europe was starting to collapse in armed conflicts as more European leaders were becoming aware. "Austria declared war on Serbia, and Serbia's ally Russia mobilized their army to come to Serbia's aid" (Document 1)

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The assassin of the Archduke and his wife was a Serbian, so Austria decided to use this against Serbia as a punishment. Austria presented Serbia with many demands. If Serbia did not follow through with the demands then they would go to war with Austria. "Therefore the Serbian leaders agreed to most of Austria's demands. They offered to have several others settled by an international conference" (Root cause of WWI)

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In June, King Ferdinand and his wife were visiting Sarajevo in and open car when 19-year-old Gavrilo Princip shot them. "The Archduke and his wife were shot at point-black range" (Root cause of WWI)