November 11, 1918: World War I Ends
Veterans Day is an official American holiday that originated after WWI as Armistice Day and was originally intended as a remembrance of November 11, 1918 when major hostilities of World War I formally ended at the 11th hour of the 11th day of the 11th month of the year 1918. Commonwealth nations refer to it as Remembrance Day.
Here are some interesting pictures from November 11, 1918.
At the urging of major veteran organizations, Armistice Day was renamed Veterans Day in 1954.

President Dwight D. Eisenhower signing HR7786, June 1, 1954, changing Armistice Day to Veterans Day. (U.S Veterans Ad\ministration)
This grainy, vertiginous clip provides a dreamlike remembrance of the day in 1948.
The 11th hour of the 11th day of the 11th month when the guns went silent
https://metro.co.uk/video/imperial-war-museum-approximate-end-wwi-1798600/?ito=vjs-link