Turmoil continued until January 1919, when the Sinn Féin party assembled in Dublin as the Dáil Éireann, or national assembly, and proclaimed themselves independent. The Anglo-Irish Treaty of 1921 gave...

Turmoil continued until January 1919, when the Sinn Féin party assembled in Dublin as the Dáil Éireann, or national assembly, and proclaimed themselves independent. The Anglo-Irish Treaty of 1921 gave independence to 26 Irish counties yet allowed six largely Protestant counties the option of remaining part of Great Britain. These six northern counties were referred to as Ulster.