Prussian expansion was known to be the primarily the result of German nationalism.
France was said to be defeated in the war that was tagged the Franco-Prussian War. Napoleon III was known to be overthrown by the French rebellion. The reason for the war is due to the southern German states supports for Prussia.
This alliance was said to be the major reason that led to the unification of Germany. The surge of German nationalism, is known to be influenced also by the experience of Germans in the Napoleonic timeframe.
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