The first Duke of Wellington became Commander in Chief, making him the professional head of the British Army.
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French King Henry IV declared war against Spain during the French Wars of Religion.
For the first time in history, all 50 states of America celebrated Martin Luther King Jr. National Holiday.
The Doomsday Clock's minute hand was moved two minutes closer to midnight, making the new Doomsday just five minutes to midnight.
Bohemia adopted the Gregorian Calendar.
NASA successfully launched the experimental CTS Hermes satellite atop a Delta 2914 rocket.
