How long did World War I last?

World War I lasted from 1914 to 1918. This conflict was primarily triggered by the assassination of Archduke Franz Ferdinand of Austria in June 1914, leading to a series of political events that escalated into a full-scale war involving many of the world’s great powers. The war officially ended with the signing of the Treaty of Versailles on June 28, 1919, but the fighting itself concluded with an armistice on November 11, 1918, marking the end of hostilities.

This timeframe is significant because it highlights not only the military engagements but also the extensive social, political, and economic changes that occurred as a result of the war. The conflict reshaped borders and national identities throughout Europe and set the stage for future international relations and conflicts, particularly leading into World War II. Understanding the duration and context of World War I is crucial for grasping its impact on 20th-century history.