1. Russia: After the Russian Revolution of 1917, the Russian Empire became the Russian Soviet Federative Socialist Republic (RSFSR). This entity later formed the core of the Soviet Union, which existed until 1991.
2. Germany: Following World War I, the German Empire was replaced with the Weimar Republic, named after the city where its constitution was drafted.
3. Austria-Hungary: The Austro-Hungarian Empire dissolved at the end of the war. Its territories were divided among several newly independent countries, including Austria, Hungary, Czechoslovakia, and Yugoslavia.
4. Czechoslovakia: This new state was formed in 1918 from parts of the former Austro-Hungarian Empire, including Bohemia, Moravia, Slovakia, and Carpathian Ruthenia.
5. Yugoslavia: Another new state that emerged after World War I, Yugoslavia was formed from parts of the former Austro-Hungarian Empire and the Kingdom of Serbia.
6. Poland: Poland regained its independence after World War I, following over a century of partitions among neighboring powers.
7. Finland: Finland declared its independence from Russia in 1917 and was recognized as a sovereign state in the aftermath of World War I.
8. Estonia, Latvia, and Lithuania: These three Baltic countries gained independence from the Russian Empire after World War I.
9. The Ottoman Empire: The Ottoman Empire, which had ruled over a vast territory for centuries, was dismantled after the war. This led to the creation of new states, including the Republic of Turkey and mandates in the Middle East under European powers.
10. Egypt: Egypt, which was under British rule during World War I, gained formal independence in 1922.