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What Happened Today in History on October 21

Explore the historical events that shaped our world on October 21st. From major milestones to cultural achievements, see what happened on this day in history. Dates for earlier events may be approximate.

Ferdinand Magellan, the Portuguese navigator sponsored by Spain discovers and enters the Straight that now bears its name, sailing through the dangerous passage which separate the South American mainland from the Tierra del Fuego archipelago,  and becoming the first European explorer to reach the Pacific Ocean from the Atlantic by sailing through the dangerous straits. More

The USS Constitution is launched in Boston. She was one of the six original frigates authorized by the Naval Act of 1794 and it is the world's oldest commissioned warship still afloat. It was designed by Joshua Humphreys, and built at Hartt's Shipyard in Boston. 

The Battle of Trafalgar takes place during the Napoleonic Wars. It was a decisive naval engagement between the British Royal Navy led by Admiral Lord Nelson and the combined fleets of the French and Spanish navies under Admiral Pierre Villeneuve and Federico Gravina. 

The fourth and final presidential debate between Vice President Richard Nixon and Senator John F. Kennedy, before the 1960 U.S. presidential election takes place at the ABC studios in New York City, New York. 

A catastrophic collapse of a pile of accumulated coal waste slides and engulfs a school in Aberfan, South Wales, killing 116 children and 28 adults. The pile had been created on a mountain slope above the Welsh village near Merthyr Tydfil, and overlaid a natural spring.