Anglo-Irish Treaty — 1921 agreement which ended the Irish War of Independence
The Anglo-Irish Treaty of 1921 ended the Irish War of Independence and established the Irish Free State as a self-governing dominion within the British Empire.
Key Facts
- Date Signed
- 6 December 1921
- Irish Free State Established
- 6 December 1922
- Status Granted
- Dominion, equivalent to Canada
- Northern Ireland Opt-Out
- Exercised under Article 12
- Outcome of Treaty Debate
- Narrowly approved by Dáil Éireann
- Aftermath
- Split led to Irish Civil War, won by pro-treaty side
By the Numbers
Location
Cause → Event → Consequence
The Irish War of Independence, fought between Irish republican forces and British authorities from 1919 to 1921, created pressure for a negotiated settlement. Both sides agreed to a ceasefire, and plenipotentiary delegates from the Irish Republic traveled to London to negotiate terms with the British government led by Prime Minister David Lloyd George.
On 6 December 1921, representatives of the British government and the Irish Republic signed the Articles of Agreement for a Treaty Between Great Britain and Ireland in London. The agreement provided for the creation of the Irish Free State as a self-governing dominion within the British Empire, with Northern Ireland retaining the right to opt out, which its Parliament exercised.
The treaty was narrowly approved by Dáil Éireann, but it deeply divided Irish nationalist opinion over dominion status and the oath of allegiance, triggering the Irish Civil War. The pro-treaty side prevailed, and the Irish Free State came into legal existence on 6 December 1922 when its constitution was enacted by royal proclamation.
Belligerents & Mobilization Analysis
Side A
1 belligerent
David Lloyd George, Winston Churchill.
Side B
1 belligerent
Michael Collins, Arthur Griffith.