In fact, as mentioned earlier, it was the most significant outcome of the war. This defeat stung the French. They were bullied and tossed around and went from threat to laughing stock in a matter of weeks. This would make them thirst for revenge. The reason this would be the most important outcome of the Franco-Prussian War was because the French had sworn revenge, and with this promise, the next war that would take place would be a war that would change humanity: and this war would be the Great War. , or the beginning of an era known as the First World War. Works Cited “Causes of the Franco-Prussian War”. Np, and Web. November 9, 2014.Duffy, Michael. "Primary documents - Ems Telegram, 1870." World War I.com. Np, August 22, 2009. Web. November 12, 2014. “The Franco-Prussian War”. Franco-Prussian War. History World International, nd Web. November 12, 2014. Kober, Stanley. “What Napoleon and Bismarck teach us about preventive war.” Cato Institute. Np, September 18, 2004. Web. November 13, 2014. “Bismarck’s Speech on Blood and Iron.” » Passing on the wisdom of the ages: famous quotes/quotations. Np, and Web. November 13, 2014. Walker, Bruce. "Bismarck's speech of blood and iron 150 years later. "Bismarck's speech of blood and iron 150 years later. New American Magazine, September 30, 2012. Web. November 13, 2014."Why France declared war in 1870." SILVAPAGES. Np, nd Web November 14..