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The Franco-Prussian War (or Franco-German War) of 1870-71 was a major conflict, where the outcome dramatically changed the balance of power in Europe, including the emergence of the German Empire. However, it has been forgotten. Although since the late nineteenth century it was widely discussed by historians, the issue of liability with respect to its outbreak remains a matter of debate. While some historians believe that this war was deliberately provoked by Bismarck in order to complete the unification of Germany, others believe that the responsibility was shared and that this conflict was simply inevitable in the context of the worsening of Franco-German relations, since the Austrian defeat at Königgrätz (Sadowa), in 1866. This thesis aims to dissociate itself from these interpretations by providing new insight regarding the role played by Bismarck during the “preliminaries” (Vorgeschichte) of 1870. Through the use of primary sources and German, French and Anglo-Saxon historiography, it will be shown first that the Hohenzollern candidature for the Spanish throne was not “made” voluntarily by the chief of the Prussian diplomacy to complement the German unification, but was promoted first and foremost for reasons of political prestige. Secondly, the famous Ems telegram amended by Bismarck cannot be seen as the trigger of this conflict, as the decision to go to war was taken in Paris before the negative effects of the message were felt. Finally, through its need of a political and diplomatic success that would have consolidated the Second Empire by forgetting earlier setbacks, through its refusal to show full satisfaction with the withdrawal of the Hohenzollern candidature and through the misconduct of its foreign policy in general, France adopted a bellicose position and found itself alone in a war it could neither prevent nor prepare. The issue in Paris was ultimately not the peaceful settlement of disputes with Prussia, but the perpetuation of French dominance on the European continent.