The first General Assembly of the United Nations opens. 51 nations were represented on that day.

The first Adventures of Tintin comic book is published. Hergé's books became hugely popular in Europe and the rest of the world.

The Treaty of Versailles takes effect. Although a ceasefire had been in place since November 11, 1918, World War I officially ended with the Treaty of Versailles.

London Underground opens. “The Tube” is the world's oldest underground railway.

Thomas Paine publishes Common Sense. The pamphlet argued for freedom from British rule and it helped spark the American Revolutionary War.