How did the Franco-German War begin?

The Franco-German War of 1870-1871 is a military conflict between the empire of Napoleon III and the German states, led by Prussia, who was seeking European hegemony.
After the victory in the Austro-Prussian-Italian war of 1866, Prussia sought to unite all German lands under its auspices and also weaken France. France, in turn, tried to exclude the possibility of a united and strong Germany. The formal reason for the war was the claim to the Spanish throne, which was put forward by a relative of the Prussian king Leopold Hohenzollern. In 1868, the Spanish Queen Isabella II was overthrown, the revolution began. After the stabilization of the situation in the country, Germany and France nominated themselves for the Spanish throne. Leopold’s claims were secretly supported by Otto von Bismarck. In Paris, they were outraged by the claims of Leopold. Napoleon III forced Hohenzollern to abandon the Spanish throne, and after that, Napoleon’s ambassador demanded that William I himself approve this rejection. On July 8, 1870, the French ambassador was sent to King William I, who was being treated in Bad Ems, to convey the discontent of Emperor Napoleon III with the candidacy Leopold. Hohenzollern on the Spanish crown. Not. wishing to escalate the conflict with France, William I soon personally contacted Leopold and his father Anton Hohenzollern and made it clear that it would be desirable to abandon the claims to the Spanish throne, Leopold agreed with the king’s arguments and stopped claiming the crown of Spain.
However, the conflict has not been exhausted. The Chancellor of Prussia Bismarck hoped to provoke France into war and became furious when he heard about the decision of William I. Napoleon III was satisfied with the diplomatic victory over Prussia, but his government and public opinion were militaristic. On July 13, France put forward a new demand to William I, according to which the Prussian king was to give an official obligation, which would prohibit Leopold from accepting the Spanish throne if he was ever offered this. By its nature, this demand was defiant and violating diplomatic etiquette, and irritated Wilhelm answered the French ambassador Vincent Benedetti that he was not entitled to make such promises,
Unsatisfied with the King’s evasive response, Paris sent a new demand, according to which William T had to give a written promise never to encroach on the dignity of France. However, the Prussian king refused the ambassador an audience, and he had to set out the requirements at the station, before Wilhelm left for the capital. The King of Prussia promised that he would continue this conversation in Berlin. Leaving Ems, he ordered the chancellor to be informed of all the events that had occurred. In the evening, Bismarck got acquainted with the dispatches received. He was disappointed with the king’s behavior, going to humiliation in order to avoid a war with France, which clearly sought to unleash it. Then Bismarck deleted from the message the king’s words spoken at the station regarding the continuation of the conversation in Berlin. In the resulting version of the dispatch, William I refused to accept
The French ambassador also “ordered to convey that he no longer has anything to tell him.” That same evening, July 13, 1870, Bismarck ordered the publication of this edited dispatch in newspapers. As he expected, the reaction of Paris was stormy – most French deputies voted for the warrior against Prussia, which was declared July 19, 1870.

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