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Francis Ferdinand was assassinated. His wife was killed which lead to WWI.
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Austria declared war on Serbia.
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Germany agrees to have a war with Russia.
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Britain and allied countries such as Australia declares war Germany two sides formed the allied powers and the central powers.
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Italy changed sides and declared war on Germany and Austria.
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British forces surrender to the Turkish forces at Kut in Mesopotamia.
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USA declare war on Germany.
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Germany crossed Somme's line and attacked it.
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Second battle of Marne started this resulted in the start of the downfall of German empire
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Germany signed armistice with allies officially ending the war.