What was causes of WW1?

World War I was caused by a complex interplay of factors, including militarism, alliances, Imperialism, and nationalism. The assassination of Archduke Franz Ferdinand of Austria-Hungary in 1914 acted as a trigger, leading to a cascade of mobilizations and declarations of war among the major European powers. The existing alliances, such as those between Germany and Austria-Hungary, and France, Russia, and Britain, escalated the conflict into a full-scale war. Additionally, rising tensions and competition for colonies heightened rivalries that contributed to the outbreak of the war.