The major global conflict that occurred between 1914 and 1918, involving many of the world's great powers, is known as World War I. Triggered by political and territorial disputes, the war saw the formation of two opposing alliances: the Allies and the Central Powers. It was characterized by trench warfare, technological advances in weaponry, and massive casualties. The war transformed geopolitical landscapes, leading to the collapse of empires and setting the stage for future conflicts, including World War II. The Treaty of Versailles marked the war's conclusion, imposing significant reparations and territorial losses on Germany.