⚔️📍 Vienna, Austria1914
Austria-Hungary's Ultimatum to Serbia — WWI Countdown Begins
Austria-Hungary issued a 48-hour ultimatum to Serbia with 15 deliberately unacceptable demands following the assassination of Archduke Franz Ferdinand. Serbia accepted all but two demands; Austria declared war anyway.
The ultimatum to Serbia triggered the alliance system that turned a Balkan crisis into World War I, killing 20 million people within four years.
Outcome
Serbia accepts most demands; Austria declares war; WWI begins