Irish Republican Army (IRA) ambushed British soldiers near Kilmichael in County Cork.
Benito Mussolini and Leandro Arpinati led squads of fighters in the melee between Fascists and Socialists in Bologna, Italy.
The Model M Postage Meter was put into commercial use.
The Communist Party of Australia (CPA) was founded in Sydney by a group inspired by the Russian Revolution.
Times Square Theater opened with a capacity of 1,032.
The Wall Street bombing took place in Manhattan, New York City.
The Nineteenth Amendment to the United States Constitution was certified, giving women the right to vote.
US Post Office banned customers from mailing children and animals.
Pope Benedict XV canonized Joan of Arc.
The Democratic Republic of Georgia's independence was recognized by the Soviet Union.
The first game of the Negro National League was played at Washington Park in Indianapolis.
The Azerbaijan Soviet Socialist Republic was founded.
The Ottoman Empire was abolished.
Adolf Hitler founded The Nazi Party in Munich, Germany.
Spain founded the Spanish Legion; an army unit made up of foreign soldiers.
The first council meeting of the League of Nations was held in Paris.
