General election in the Irish Free State: The pro-Treaty Sinn Féin party wins a large majority.

The Irish Free State, also known by its Irish name Saorstát Éireann, was a state established in December 1922 under the Anglo-Irish Treaty of December 1921. The treaty ended the three-year Irish War of Independence between the forces of the Irish Republic – the Irish Republican Army (IRA) – and British Crown forces.

Sinn Féin is the name of an Irish political party founded in 1905 by Arthur Griffith. It became a focus for various forms of Irish nationalism, especially Irish republicanism. After the Easter Rising in 1916, it grew in membership, with a reorganisation at its Ard Fheis in 1917. It split in 1922 in response to the Anglo-Irish Treaty which led to the Irish Civil War and saw the origins of Fianna Fáil and Fine Gael, the two parties which have since dominated Irish politics. Another split in the remaining Sinn Féin organisation in the early years of the Troubles in 1970 led to the Sinn Féin of today, which is a republican, left-wing nationalist and socialist party.