World War I officially ended on June 28, 1919 with the signing of the Treaty of Versailles.The fighting actually stopped on November 11, 1918, when Germany and the allied nations agreed to an armistice.  Veterans Day was not always called veterans day it used to be called Armistic day, in 1919, Woodrow Wilson proclaimed November 11 as Armistice Day.

This holiday was intended to acknowledge the efforts of Americans who served in World War I. In 1938, the word “Armistice” was replaced with “Veterans” to recognize the many Americans who were mobilized during  World War II. 1954, President Dwight D. Eisenhower officially changed it to Veterans day.

Beginning in 1938 Veterans Day pays tribute to all American veterans even the dead especially gives thanks to living veterans who served their country during the war or at peacetime. Canada has Remembrance Day, while Britain has Remembrance Sunday (the second Sunday of November). In Europe, Great Britain and the Commonwealth countries it is common to observe two minutes of silence at 11 a.m every November 11. Veterans Day is now a day to honor all American veterans.

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https://www.history.com/topics/holidays/veterans-day-facts

https://www.reference.com/holidays-celebrations/importance-veterans-day-883aaf1749f8d36f