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Spark of World War I -> assassination of Archduke Franz Ferdinand in Sarajevo
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Austria-Hungary declared war on Serbia
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Germany who allied with Austria-Hungary, declared war on Russia
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France bounded a treaty with Russia, found itself in war against Germany and in extension woth Austri-Hungary
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Britain allied with France and declared war on Germany to defend France and Germany invaded Belgium
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Austria-Hungary declares war on Russia and Serbia declares war on Germany
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Japan declared war on Germany
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Austria-Hungary responded to Japans war declare on Germany and declared war on them
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Battle of Tannenburg begins
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Germany declares war on Belgium