At the settlement of the Congress of Vienna in 1815, the principle of nationalism was ignored in favor of preserving the peace. Germany and Italy were left as divided states, but strong nationalist movements and revolutions led to the unification of Italy in 1861 and that of Germany in 1871. Another result of the Franco-Prussian War of 1870-71 was that France was left seething over the loss of Alsace-Lorraine to Germany, and Revanche was a major goal of the French. Nationalism posed a problem for Austria-Hungary and the Balkans, areas comprised of many conflicting national groups. The ardent Panslavism of Serbia and Russia’s willingness to support its Slavic brother conflicted with Austria-Hungary’s Pan-Germanism.