The major global conflict that lasted from 1914 to 1918 is known as World War I. It was triggered by the assassination of Archduke Franz Ferdinand of Austria, leading to a complex web of alliances and entanglements drawing multiple nations into war. The conflict involved many of the world's great powers, divided primarily into the Allies and the Central Powers. World War I was characterized by trench warfare, significant loss of life, and extensive use of new military technology. The war ultimately reshaped national boundaries and led to significant political changes, setting the stage for future conflicts, including World War II.