The Most Important Events That Changed History Forever

The murder of Ferdinand and his wife prompted Austria-Hungary to declare war against Serbia, in turn triggering the events that eventually led to the First World War. The couple had actually survived an earlier assassination attempt that day when someone launched a bomb at their car, but the grenade detonated behind them.

World War I (1914)

World War I was known as "the war to end all wars." It mobilized over 70 million military personnel and was one of the largest wars in history. The war began on July 28, 1914, and lasted four years, until November 11, 1918.