1919-1921: The Irish Republican Army is established in 1919, replacing the Irish Volunteers (which was founded in 1913) as a militant organization fighting for Irish national independence from British rule. The Irish War for Independence (1919-1921) results in the signing of the Anglo-Irish Treaty, which designates Southern Ireland as the Irish Free State, a member of the British Commonwealth. Northern Ireland, however, remains entirely under British rule.
1937: A new constitution changes the name of the Irish Free State to Ireland, or...
