Which country was dissolved as a result of World War I?

The dissolution of Austria-Hungary following World War I is a significant historical event marked by the empire's fragmentation into several independent nations. The war caused substantial upheaval, resulting in the weakening of Austria-Hungary's central authority and increasing nationalist sentiments among the various ethnic groups within its borders. As a result of the Treaty of Saint-Germain in 1919, Austria emerged as a smaller, landlocked state while Hungary also became independent, leading to the creation of new states such as Czechoslovakia, Yugoslavia, and parts of modern-day Romania. This reorganization was part of a broader trend in post-war Europe, where empires collapsed and nation-states emerged, reflecting a shift towards self-determination for various nationalities.

Other choices do not accurately represent countries that were dissolved. Germany, while it faced severe territorial losses and political restructuring, did not dissolve as a nation. The Ottoman Empire also saw significant territorial losses and an eventual transformation into modern Turkey, but it was not formally considered "dissolved" in the same manner as Austria-Hungary. Italy, on the other hand, emerged from the war with expanded territory and remained a unified country.