December 20

December 20 is the 355th day of the year, and the American record for it runs from 1803 to 2019 — a span of 216 years. The entry that anchors it: The Louisiana Purchase is completed at a ceremony in New Orleans, 1803.

The antebellum decades brought the date closer to the country’s central argument. In 1803, the Louisiana Purchase is completed at a ceremony in New Orleans. Then, in 1860, South Carolina becomes the first state to attempt to secede from the United States with the South Carolina Declaration of Secession.

After 1945 the date reflects a country operating at global scale. In 1951, Experimental Breeder Reactor I near Arco, Idaho, U.S., became the world's first electricity-generating nuclear power plant when it became able to illuminate four 200-watt light bulbs. A year later, in 1952, a United States Air Force C-124 crashes and burns in Moses Lake, Washington, killing 87 of the 115 people on board. Then, in 1968, the Zodiac Killer murders his first two officially confirmed victims, David Arthur Faraday and Betty Lou Jensen, on Lake Herman Road in Benicia, California, United States. Two years on, in 1970, Koza riot — after a series of hit-and-runs and other vehicular incidents involving American service personnel, roughly 5,000 Okinawans take to the streets, clashing with American law enforcement in protest against the U.S. occupation of Okinawa. Then, in 1989, the United States invasion of Panama deposes Manuel Noriega.

The most recent entries fall within living memory. In 2019, the United States Space Force becomes the first new branch of the United States Armed Forces since 1947.

The date is also a birthday. Among the Americans born on December 20: Arthur Lee (1740), American physician and diplomat; Laura M. Hawley Thurston (1812), American poet and educator; Elsie de Wolfe (1865), American actress and interior decorator; Harvey Samuel Firestone (1868), American businessman, founded the Firestone Tire and Rubber Company; and Charley Grapewin (1869), American actor.

December 20 is also a date of endings. Among the Americans who died on it: Sacagawea (1812), American explorer; John Bell (1820), American farmer; Gaspar Tochman (1880), Polish-American colonel and lawyer; and George C. Magoun (1893), American businessman.

What holds these 8 entries together is nothing more than the calendar, and nothing less. 216 years separate the earliest from the latest, and each was once simply the present day.