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The Treaty of Frankfurt (French: Le traité de Francfort; German: Friede von Frankfurt) was a peace treaty signed in Frankfurt on May 10, 1871, at the end of the Franco-Prussian War.



Treaty of Frankfurt

The treaty:

  • Confirmed the frontier between the French Third Republic and the German Empire - involving the cession of Alsace, Lorraine and many parts of Vosges by France to Germany.
  • Gave residents of the returned Alsace-Lorraine region until October 1, 1872 to decide between keeping their French nationality and emigrating, or to remain in the region and become German citizens.
  • Set a framework for the withdrawal of German troops from certain areas.
  • Regulated the payment of France's war indemnity of five billion francs (due within three years).
  • Recognized the acceptance of William I of Prussia to be German Emperor.
  • Required military occupation in parts of France until the indemnity was paid (to the surprise of Germany, the French paid the indemnity quickly).

The treaty also clarified the following points:

  • The use of navigable waterways in connection to Alsace-Lorraine
  • Trade between the two countries
  • The return of prisoners of war

Factors that influenced the boundary



The German military spoke up for control of the Alsace region, up to the Vosges (mountain range) and the area between Thionville (Diedenhofen) and Metz as a requirement for the protection of Germany. Most importantly, the German military regarded control of the route between Thionville and Metz as the most important area of control if there were ever to be a future war with France. [1]


Without a westward shift in the boundary the new empire's frontier with France would have been largely divided between the states of Baden and Bavaria, whose governments were less than enthusiastic with the prospect of having a vengeful France on their doorstep. It also would have necessitated the stationing of substantial Imperial forces within these states' borders, possibly compromising their ability to exercise the considerable autonomy the southern states were able to maintain in the unification treaty. A shift in the frontier alleviated these issues.


The new political border largely (though not entirely) followed the linguistic border. The fact that the majority of the population in the new Imperial Territory (Reichsland) territory spoke German dialects allowed Berlin to justify the annexation on nationalistic grounds.


Natural resources in Alsace-Lorraine (iron-ore, and coal) do not appear to have played a role in Germany's fight for the areas annexed.[2] Military annexation was the main stated goal along with unification of the German people. At the same time, France lost 1,447,000 hectares, 1,694 villages and 1,597,000 inhabitants. It also lost 20% of its mining and steel potential. The treaty of trade of 1862 with Prussia was not renewed but France granted Germany, for trade and navigation, a most-favoured nation clause. France would respect the clauses of the Treaty of Frankfurt in their entirety until 1914.


This treaty polarized French policy towards Germany for the next forty years. The reconquest of Alsace-Lorraine, the "lost provinces", became an obsession characterized by a revanchism which would be one of the most powerful motives in France's involvement in World War I.

The Alsace-Lorraine regions were yielded back to France under the 1919 Treaty of Versailles


  1. ^ Hawthorne, 217
  2. ^ Hawthorne, 248


  • Hawthorne, Richard (Jan, 1950). "The Franco-German Boundary of 1871", World Politics, pp. 209-250.
  • Eckhardt, C.C. (May, 1918). "The Alsace-Lorraine Question", The Scientific Monthly, Vol. 6, No. 5, pp. 431-443.


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