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Archduke Franz Ferdinand was assinated by Gavrillo Princip in June 1914.
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Austria-Hungary declares war on Serbia in July 1914. This was because Serbia assinated Ferdinand.
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Germany declares war on Russia.
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The Germans stationed their troops and invaded Belgium and burned down the town of Louvain.
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Great Britain declares war on Germany. This was seen as a start of World War I.
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Germany is at war against Belgium, France, Russia and Great Britain.
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Germany and France declare war on each other.
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Ottoman Empire enters World War I on October 28, 1914.
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Italy declares war on Austria-Hungary.
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Bulgaria enters World War 1 on the side of Central Powers.
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Germany declares war on Portugal.
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Romania declares war on Austria-Hungary, this declares them into entering World War 1.
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Greece declares war on the Central Powers.