French nationalism resulted in hostility with Germany because they tried to regain the Imperial Territory of Alsace-Lorraine that was taken by Germany after the Franco-Prussian War.
French nationalism led to strong hostility toward Germany due to the loss of Alsace-Lorraine after the Franco-Prussian War, differing definitions of nationalism, historical rivalries, militarization, and a desire for revenge. These factors created a cycle of resentment and mistrust between the two nations.
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