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Triple Alliance was formed between Germany, Austria-Hungary, and Italy.
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The increase of mass armies raised tensions in Europe even farther and with the size of each army, it was obvious that if there was a war it would be destructive.
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Triple Entente was formed between France, Great Britain, and Russia.
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All western countries had established a draft into the military with the exception of Great Britain and the US
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Archduke Francis Ferdinand and his wife were shot by a 19 year old Bosnian Serb. The conspirators wanted Bosnia to be free of Austria-Hungary and to be a part of the Serbian Kingdom.
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Germany agrees to back up Ausria-Hungary against Serbia even though Serbia wasnt directly involved in the assasination.
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Russia mobilizes military to aid Serbian defenses.