North and South Vietnam were formally reunified after more than twenty years of war.
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A peace agreement was signed between King John of England and Prince Louis VIII of France, marking the end of the Siege of Roche-au-Moine, France.
The first Earl of Shaftesbury, Anthony Ashley Cooper, was arrested for high treason in England.
The International Astronomical Union named Pluto's fourth and fifth moons Kerberos and Styx.
Inventor Benjamin J. Lane patented the first self-contained gas mask.
Charles J. Guiteau shot US President James A. Garfield in Washington, D.C.
