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Archduke Franz Ferdinand, heir to the Austrian throne, and his wife, visit Sarajevo in Bosnia. A bomb is thrown at their auto but misses. Undaunted, they continue their visit only to be shot and killed a short time later by a lone assassin. Believing the assassin to be a Serbian nationalist, the Austrians target their anger toward Serbia.
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The Archduke is murdered sparking WWI
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Russians begin partial troop mobilization as a precaution. The Germans then warn Russia on its mobilization and begin to mobilize themselves.
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Germany declares war on Russia
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Germany declares war on France, and invades neutral Belgium. Britain then sends an ultimatum, rejected by the Germans, to withdraw from Belgium.