The end of the war, in November 1918, was followed in Ireland by the December 1918 general election, the majority of seats being won by the republican separatist Sinn Féin party, then in January 1919 by the Irish War of Independence, so that the Act was never implemented. The future of Home Rule was determined by the Government of Ireland Act 1920. It established Northern Ireland, with a functional government, and Southern Ireland, the governmental institutions of which never functioned completely. Southern Ireland, following the Anglo-Irish Treaty, became the Irish Free State.