World War I was a significant turning point that shaped the map of modern Europe. The consequences of this conflict were deep and widespread, changing state boundaries, shaping national identity, and triggering various new political movements. One of the main impacts was the collapse of great empires such as the Austro-Hungarian Empire, the Ottoman Empire, and the Russian Empire. This collapse led to the formation of new states, such as Czecho-Slovakia and Yugoslavia. These changes helped create deeper ethnic identities, solidify boundaries based on ethnic groups, and install nation-state systems in Central and Eastern Europe. In addition, the Treaty of Versailles in 1919 was a key factor in determining the new map of Europe. This agreement required Germany to cede territory, including Alsace-Lorraine, to France, as well as parts of the eastern region which became the beginning of the formation of the new Poland. This territorial division also gave rise to deep-rooted feelings of dissatisfaction among nations who felt oppression or loss of identity. The political consequences of this war also facilitated the rise of new ideologies. Communism, following the Bolshevik Revolution in Russia, spread rapidly across Europe, changing the social and political structure of countries and leading to the emergence of totalitarian governments in several countries. Most countries formed after war suffer from internal tensions, with deep conflict between different ethnicities, often leading to violence and instability. The social and economic impacts are also worth noting. These wars destroyed resources and forced many countries to change employment and industrial patterns. With the fall of the Ottoman Empire, the Balkan region, rich in ethnic diversity, became a site of constant conflict, adding complexity to the map of Europe. The peace agreement that followed also influenced the formation of international organizations. The birth of the League of Nations demonstrated efforts to create multilateral diplomacy to prevent future conflict. However, this structure proved insufficiently effective, facilitating new tensions that would continue into World War II. Overall, the impact of World War I on the map of modern Europe was fundamental, not only changing geographical boundaries but also influencing social, political, and cultural aspects. This influence was long-lasting, laying the foundation for further changes in Europe and shaping complex historical narratives to this day.