German nationalism is the nationalist idea that Germans are a nation and promotes the unity of Germans into a nation state. The earliest origins of German nationalism began with the birth of Romantic nationalism during the Napoleonic Wars when Pan-Germanism started to rise. Advocacy of a German nation began to become an important political force in response to the invasion of German territories by France under Napoleon. After the rise and fall of Nazi Germany during World War II, German nationalism has been generally viewed in the country as taboo. However, during the Cold War, German nationalism arose that supported the reunification of East and West Germany that was achieved in 1990.
German nationalism has faced difficulties in promoting a united German identity as well as facing opposition within Germany. The Catholic-Protestant divide in Germany at times created extreme tension and hostility between Catholic and Protestant Germans after 1871, such as in response to the policy of Kulturkampf in Prussia by German Chancellor and Prussian Prime Minister Otto von Bismarck, that sought to dismantle Catholic culture in Prussia, that provoked outrage amongst Germany's Catholics and resulted in the rise of the pro-Catholic Centre Party and the Bavarian People's Party. There have been rival nationalists within Germany, particularly Bavarian nationalists who claim that the terms that Bavaria entered into Germany in 1871 were controversial and have claimed the German government has long intruded into the domestic affairs of Bavaria. Outside of modern-day Germany in Austria, there are Austrian nationalists who have rejected unification of Austria with Germany on the basis of preserving Austrians' Catholic religious identity from the potential danger posed by being part of a Protestant-majority Germany.