The First World War, fought between 1914 and 1918, was one of the most significant military conflicts in world history. The origins of this war are complex, involving a variety of political, social and economic factors. One of the main causes was the rivalry between the great European powers, including Germany, England, France, Russia, and Austria-Hungary. Complicated alliance systems, such as the Triple Alliance and the Triple Entente, exacerbated tensions, leading to rapid escalation after the assassination of Archduke Franz Ferdinand of Austria in 1914. The impact of the First World War was far-reaching and changed the world order. First, this war caused the deaths of around 16 million people and injured millions more. These sacrifices created deep sorrow in many countries and destroyed communities. Additionally, the war also resulted in the collapse of several major empires, including the Austro-Hungarian Empire, the Ottoman Empire, and the Russian Empire, causing significant geopolitical changes in Europe and the Middle East. The global economy also experienced a major impact. After the war, many countries experienced severe inflation and ballooning debt. These conditions exacerbated economic instability, contributing to the Great Depression of the late 1920s. On the other hand, the war also accelerated the development of military industry and technology, which had an impact on future innovation in the civilian sector. The First World War also gave rise to significant social movements. In many countries, women’s roles have changed drastically due to the need for labor in industry and the military sector. This encouraged the fight for voting rights for women and brought about changes in gender roles in society. Finally, the war left a deep ideological legacy. The consequences of the First World War created fertile conditions for the emergence of totalitarianism, seen in the rise of the Nazis in Germany and communism in the Soviet Union. Peace agreements, especially the Treaty of Versailles, were marked by dissatisfaction and a sense of injustice, which was one of the factors leading to the Second World War. In all these aspects, the First World War has formed the basis for many of the dynamics we see in modern politics and society today.