Partition of Ireland Formalized

Date: December 3, 1925 • Location: Dublin City, Ireland

Final agreement is signed between the Irish Free State, Northern Ireland and the United Kingdom formalizing the Partition of Ireland.

The Irish Free State, also known by its Irish name Saorstát Éireann, was the Irish state established in December 1922 under the Anglo-Irish Treaty of December 1921, initially as a Dominion. 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.