World War I political Central Powers Austria-Hungary Germany Bulgaria Ottoman Empire Bolshevik seizure of power Russia Allies of World War I Belgium Romania Greece nation-states collapse of Austria-Hungary Ottoman Russian Empires Soviet Union Europe Italy Allies France
World War I had radically altered the political European map with the defeat of the Central Powers—including Austria-Hungary, Germany, Bulgaria, and the Ottoman Empire—and the 1917 Bolshevik seizure of power in Russia, which led to the founding of the Soviet Union. Meanwhile, the victorious Allies of World War I, such as France, Belgium, Italy, Romania, and Greece, gained territory, and new nation-states were created out of the collapse of Austria-Hungary and the Ottoman and Russian Empires.
