On this day, four fifths of Ireland declared independence from Britain with the signing of the Anglo-Irish Treaty.

The treaty declared that the 26 southern states would be part of the Irish Free State, the 6 northern counties would remain in the United Kingdom.

The Irish Free State would initially become a member of the British Commonwealth, but this would be revoked in 1949 (after the country remained neutral in the Second World War) and the country changed its name to The Republic of Ireland, or Eire.