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bismark
-Bismarck turned up the diplomatic heat by releasing, on 14 July 1870, a doctored version of a telegram ostensibly from the Kaiser to Bismarck himself, called the Ems Telegram. The effect of the telegram was to simultaneously insult both France and Prussia over their inability to resolve the dispute over the Spanish throne. -
napoleon III
Napoleon III declared war against Prussia on 19 July 1870 -
archduke
The explosive that was World War One had been long in the stockpiling; the spark was the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, in Sarajevo on 28 june 1914 -
austrian hungary
Austria-Hungary declared war on Serbia on 28 July 1914 -
japan
Japan declared war on Germany on 23 august 1914 -
Germany
Germany’s policy of unrestricted submarine warfare forced the US to finally enter the war on 6 April 1917. -
napolean 3
Napoleon III, facing civil revolt at home over quite unrelated matters, and receiving encouraging noises from his military commanders, responded by declaring war against Prussia five days later, on 19 July 1870.