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The assassination of Archduke Franz Ferdinand of Austria-Hungary. A Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
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Russia deploys its army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the deployment of the rest of the European Powers. inevitably that leads to nations being hostile towards one another.
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The country of Germany decides to invade Belgium officially starting WW1
