World War I, fought between 1914 and 1918, had a profound impact on modern Europe. This conflict caused significant changes in the political, economic and social map of the continent. The political impact of World War I was felt and set the stage for many future events. One of the main changes was the creation of new states, such as the Czech Republic, Yugoslavia, and Poland, after the collapse of great empires such as the Austro-Hungarian and Ottoman ones. This change in the political map created new tensions in many regions. In addition, World War I also accelerated the emergence of totalitarian ideology in Europe, with the increasing power of parties such as the Bolsheviks in Russia and the Nazis in Germany. In the economic field, the impact of World War I was very detrimental. Many European countries suffered from severe inflation and mounting debt due to the high costs of war. The German economy, in particular, was devastated after the war, resulting in the Great Economic Crisis. The previously strong industrial sector experienced a drastic decline, and many workers lost their jobs. This created social discontent that became fertile ground for the rise of extremism and populism in the following decades. Social aspects were also affected by the impact of World War I. Changes in gender roles emerged as many women entered the workforce to replace men who went to war. These changes spurred a stronger women’s rights movement after the war. In addition, the mental trauma of war, known as “shell shock,” began to receive more attention, marking a new understanding of mental health. Culture also underwent a transformation, with the emergence of new artistic movements such as Dadaism and Surrealism which reflected disillusionment with traditional post-war values. The war also sparked innovation in military technology and changed the way subsequent conflicts were conducted. From a military perspective, war provides important lessons about strategy and tactics. Countries learn from the failures and successes that occur during conflicts, which impacts the development of military structures in the years to come. Overall, the impact of World War I on modern Europe was not only visible from political and economic aspects, but also touched the social, cultural and mental life of society. This war formed the foundation for Europe’s development in the 20th century and prompted changes that continue to reverberate to this day.