Arthur Griffith is elected President of the Irish Free State.

General election in the Irish Free State: a large majority goes to the pro-Treaty Sinn Féin.

The Irish Civil War begins with the shelling of the Four Courts in Dublin by Free State forces.

Michael Collins, Commander-in-Chief of the Irish Free State Army is shot dead during an Anti-Treaty ambush at Béal na mBláth, County Cork, during the Irish Civil War.

Author and Irish Republican Army member Robert Erskine Childers is executed by an Irish Free State firing squad for illegally carrying a revolver.

One year to the day after the signing of the Anglo-Irish Treaty, the Irish Free State comes into existence.

The British Parliament enacts the Statute of Westminster 1931, establishing legislative equality between the self-governing dominions of the Commonwealth of Australia, the Dominion of Canada, the Irish Free State, Dominion of Newfoundland, the Dominion of New Zealand, and the Union of South Africa.

The Irish Free State is replaced by a new state called Ireland with the adoption of a new constitution.

The twenty-six counties of the Irish Free State become the Republic of Ireland.