Answer:
the assassination of Archduke Franz Ferdinand.
Step-by-step explanation:
The First World War was started in 1914 and continues up to 1918 with many possible causes and contradictory motivations. Millions of lives have been lost in this confounding war that encroached on the world. Historians have usually considered many approaches to address the complexity of the s origins of the First World War by closely observing global patterns that had evolved over several years. However, the immediate cause for the war was the assassination of Archduke Franz Ferdinand in the region both claimed by Austria and Serbia.