What major conflict was triggered by the assassination of Archduke Franz Ferdinand?

The assassination of Archduke Franz Ferdinand of Austria-Hungary in June 1914 is recognized as the immediate catalyst for World War I. His death was the result of a carefully plotted plan by a group of Serbian nationalists, which set off a chain reaction of events due to the intricate network of alliances and tensions among European powers at the time.

Following the assassination, Austria-Hungary issued an ultimatum to Serbia, which, when only partially accepted, led Austria-Hungary to declare war on Serbia. This act activated a series of alliances that had been established over the previous decades. Russia mobilized in support of Serbia, leading Germany to declare war on Russia, followed by declarations of war from other nations. In a matter of weeks, the conflict escalated into a full-scale global war involving many of the world's major powers, which is characterized as World War I.

In contrast, the other conflicts mentioned—World War II, the Korean War, and the Vietnam War—occurred in different contexts and were sparked by entirely separate political, economic, and social factors. World War II, for instance, was heavily influenced by the aftermath of World War I and the Treaty of Versailles, while the Korean and Vietnam wars were influenced by Cold