When did World War I begin?

World War I began on 28 July 1914, marking the start of a conflict that would last until November 1918. This date is significant as it follows the assassination of Archduke Franz Ferdinand of Austria on June 28, 1914, which set off a chain of events leading to the war. The July date represents when Austria-Hungary declared war on Serbia, triggering alliances and a broader conflict involving multiple nations. The choice reflecting July 28, 1914, is correct as it is widely recognized as the official start of World War I, grounding its importance in both historical timelines and the context of the international relations of that era. Understanding this date is crucial for grasping the complex events leading to and throughout the war itself.