<P> In 1922 , after the Irish War of Independence and the Anglo - Irish Treaty , most of Ireland seceded from the United Kingdom to become the independent Irish Free State , which after the 1937 constitution , began to call itself Ireland . The six northeastern counties , known as Northern Ireland , remained within the United Kingdom . The Irish Civil War followed soon after the War of Independence . The history of Northern Ireland has since been dominated by sporadic sectarian conflict between ( mainly Catholic ) Irish nationalists and ( mainly Protestant ) unionists . This conflict erupted into the Troubles in the late 1960s , until peace was achieved with the Belfast Agreement thirty years later . </P>
when did ireland gain its independence from england
In 1922