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In page Politics:

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Some nation states, such as Germany and Italy, came into existence at least partly as a result of political campaigns by nationalists, during the 19th century. In both cases, the territory was previously divided among other states, some of them very small. Liberal ideas of free trade played a role in German unification, which was preceded by a customs union, the Zollverein. National self-determination was a key aspect of United States President Woodrow Wilson's Fourteen Points, leading to the dissolution of the Austro-Hungarian Empire and the Ottoman Empire after the First World War, while the Russian Empire became the Soviet Union after the Russian Civil War. Decolonization lead to the creation of new nation states in place of multinational empires in the Third World.[citation needed]