What accurately explains one of the factors that contributed to world war l?

One significant factor that contributed to World War I was the complex system of alliances that developed in Europe during the early 20th century. Major powers, including Germany, Austria-Hungary, France, Russia, and Britain, formed alliances that promised mutual defense. This web of agreements meant that a conflict involving one nation could quickly escalate into a broader war, as allied nations were drawn in to support their partners. The assassination of Archduke Franz Ferdinand of Austria-Hungary in 1914 triggered these alliances, leading to a rapid escalation into a full-scale war.