What was an immediate result of the assassination of Archduke Franz Ferdinand?

The immediate result of the assassination of Archduke Franz Ferdinand on June 28, 1914, was a cascade of political tensions that ultimately led to the outbreak of World War I. Austria-Hungary issued an ultimatum to Serbia, which, despite its attempts to comply, was deemed insufficient. This spurred Austria-Hungary to declare war on Serbia on July 28, 1914, triggering a complex web of alliances and mobilizations among major European powers, leading to a full-scale war.