By Day: Historical Events on March 21st

The Battle of Gaza occurs between Alexander the Great and Darius III of Persia, leading to Alexander's victory and the collapse of Persian rule.

King Henry V of England dies, leaving his infant son, Henry VI, as king.

The Sharpeville massacre in South Africa occurs as police open fire on a demonstration against apartheid, resulting in numerous deaths.

Alcatraz Federal Penitentiary in San Francisco Bay closes.