The Anglo-Irish Treaty, agreed to by the British Parliament and Sinn Féin, was ratified.
Eamon de Valera publicly repudiated the Anglo-Irish Treaty.
The Anglo-Irish Treaty was signed.
US President Warren G. Harding signed the Willis-Campbell Act, which took effect from this day.
The Japanese Prime Minister, Hara Takashi, was assassinated in Tokyo.
Nahalal, the first moshav in modern-day Israel, was settled.
Margaret Gorman from Washington, D.C., became the very first Miss America.
The Chinese Communist Party was founded in Shanghai.
Alice Mary Robertson became the first woman to govern the US House of representatives.
The Communist Party of China was founded with Chen Duxiu as the leader.
The British Legion was formed to take care of veterans by giving financial, social, and emotional support to members and veterans of the British Armed Forces.
National Hospital Day was first observed.
The Communist Party of Romania was founded.
Perfume Chanel No.5 was released.
West Virginia became the first state to impose a sales tax.
Albert Einstein visited New York City and lectured on his Theory of Relativity for the first time.
The world's first international women's sporting event began in Monaco.
The Mysterious Affair at Styles, by British crime writer Agatha Christie, was published in the UK.
The Iraqi Army was formed.
