Hawaii became the 50th state to join the United States of America after a referendum.

Leon Trotsky was fatally wounded with an ice axe by Spanish communist Ramón Mercader.

The Cold War border between Austria and Hungary was opened for a short period of time for the Pan-European picnic.

The 19th Amendment to the US Constitution was ratified, guaranteeing all American women the right to vote.

Parliament passed the Marriage Act that legalised civil marriages and introduced their formal registration.

Queen Victoria sent the first telegram using the newly-installed transatlantic telegraph cable to US President James Buchanan.

The Panama Canal was officially opened to traffic with the transit of SS Ancon.

The Atlantic Charter was issued by U.S. President Franklin D. Roosevelt and British Prime Minister Winston Churchill.

The first complete performance of Wagner’s Ring cycle took place in the Bavarian town of Bayreuth.

The Battle of the Bogside began in Derry, Northern Ireland, marking one of the first major conflicts of The Troubles.