There are a number of political parties in Ireland, and coalition governments are common. The two historically largest parties, Fianna Fáil and Fine Gael, arose from a split in the original Sinn Féin, Fine Gael from the faction (Cumann na nGaedheal) that supported the 1921 Anglo-Irish Treaty and Fianna Fáil from the anti-Treaty faction. The division on the Treaty had also caused the Irish Civil War (1922–23), leading to the difference between the parties being described as "Civil War politics", to distinguish it from a more common left-right political divide.