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Germany and Austria Hungary form "Dual Alliance"
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Italy joins Austria Hungary and Germany to form Triple Alliance
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Germany signs Reinsurance Treaty with Russia
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Germany begins shipbuilding program to challenge Britain
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Kaiser Wilhelm II allows Reinsurance Treaty to expire
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France and Russia form Dual Alliance
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Britain, France, and Russia form Triple Entente
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Austria annexes Bosnia and Herzegovina
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Serbia is outraged by the annexation
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Germany and Russia conflict in second Balkan crisis over land
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Assassination of Archduke Ferdinand
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Germany offers Austria Hungary its firm support.