Archduke Franz Ferdinand was assassinated on this day in 1918.
You might be interested in The Best Resources For Learning About World War I.
RIGHT NOW in 1914, Austria’s Archduke Franz Ferdinand and his wife Sophie are fatally shot in Sarajevo by a 19-year-old Serbian nationalist named Gavrilo Princip. Within 30 days, the powers of Europe will be at war. pic.twitter.com/zQZZgW5flx
— Military History Now (@MilHistNow) June 28, 2018