World War I, often referred to as the “Great War,” was a global conflict that lasted from 1914 to 1918. The war’s origins stem from a complex combination of nationalism, imperialism, military alliances, and militarism. The creation of alliances such as the Triple Entente, consisting of France, England, and Russia, and the Triple Alliance, consisting of Germany, Austria-Hungary, and Italy, exacerbated tensions between the major powers of Europe. One of the main triggers for the war was the assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 in Sarajevo. This action triggered a series of events that culminated in the declaration of war. Austria-Hungary declared war on Serbia, which was supported by Russia. In no time, these alliances dragged other countries into the conflict, turning it into a large-scale war. This war took place on several fronts, including the Western Front in France and Belgium, and the Eastern Front in Russia. The war tactics used, such as trench warfare, caused great destruction and many casualties. It is estimated that around 16 million people died and 21 million were injured as a result of fighting, disease, and famine. The impact of World War I was very broad and touched various aspects of people’s lives. One of the most significant impacts is the change in the political map in Europe. After the war, many great empires such as Austria-Hungary and the Ottomans collapsed, resulting in the formation of new states such as Czechoslovakia and Yugoslavia. This process resulted in long-lasting ethnic tensions in the region. The global economy was also hit hard. Many countries were forced to take on huge debts to finance the war. Germany, as a result of its defeat, was obliged to pay heavy reparations through the Treaty of Versailles. This not only destroyed the German economy, but also created resentment and a rise in nationalism that contributed to the emergence of World War II. World War I also sparked significant social change. Many women began entering the workforce to replace the men who had gone into war, providing an opportunity for the women’s rights movement around the world. On the other hand, technological innovations in the military field, such as tanks, airplanes, and poison gas, began to emerge during this period, changing the way wars were fought in the future. Overall, World War I was a turning point in history, changing global dynamics and triggering many of the events that shaped the 20th century. Its impact is still felt today, and understanding the origins and consequences of this war is crucial to understanding the conflicts that occur in modern times.