What years mark the span of World War I?

The span of World War I is marked by the years 1914 to 1918. This conflict began with the assassination of Archduke Franz Ferdinand of Austria in June 1914 and was characterized by widespread trench warfare and significant changes in military technology. The war officially ended with the signing of the Treaty of Versailles on June 28, 1919, but the major combat operations ceased with an armistice on November 11, 1918.

Understanding the correct years helps contextualize the conflict within the timeline of early 20th-century history, including its impact on subsequent geopolitical developments and the lead-up to World War II. The other timeframes listed do not align with the actual duration of the war, as they either fall before the conflict began or extend beyond its conclusion, indicating a mismatch with historical timelines.